21 Nov 2014:
U.S. Can Cut Greenhouse Gas Emissions 80 Percent by 2050, Study Says
The United States can reduce greenhouse gas emissions by 80 percent by 2050, using existing or near-commercial technologies, according to researchers with the Deep Decarbonization Pathways Project
. The study analyzed scenarios with four types of decarbonized electricity: renewable energy, nuclear energy, fossil fuel with carbon capture and storage, and a mixed case. The scenarios achieved reductions of 83 percent below 2005 levels and 80 percent below 1990 levels, according to the study, which was released ahead of next month’s climate talks in Lima, Peru, and negotiations in Paris in December 2015. The energy efficiency of buildings, transportation, and industry would need to increase through the use of smart materials and energy-efficient designs, and vehicles will need to be fueled with electricity generated from wind, solar, or nuclear, as opposed to coal, the researchers said. They project the net costs would be on the order of 1 percent of gross domestic product per year. The 80-percent reduction by 2050 is a long-standing goal of the Obama administration, in line with global commitments to limit warming to less than 2 degrees C.
20 Nov 2014:
Real-Time Ocean Acidification
Data Now Available for U.S. Pacific Coast
Researchers, coastal managers, and shellfish farmers along the U.S. Pacific coast can now get real-time ocean
Web portal for ocean acidification data
acidification data through an online tool
developed by the National Oceanic and Atmospheric Administration (NOAA). The data — which includes measurements of pH, carbon dioxide concentrations, salinity, and water temperatures at various sites — should help organizations and businesses make decisions about managing coastal resources and craft adaptation strategies, NOAA researchers say. The tool will feature data from five shellfish hatchery sites along the Pacific coast along with readings from NOAA’s ocean acidification monitoring sites. Ocean acidification is driven primarily by absorption of atmospheric CO2 by ocean waters, which changes seawater chemistry in a way that makes it difficult for many marine organisms to form their shells.
14 Nov 2014:
New Material Can Trap Powerful Greenhouse Gases Efficiently, Chemists Say
Scientists from the U.S. and Taiwan have developed a new type of lightweight, self-assembling molecule that can capture large amounts of potent greenhouse gases,
This porous material traps greenhouse gases.
according to a report
in Nature Communications
. The molecules create a lightweight structure with many microscopic pores that can adsorb gases such as chlorofluorocarbons (CFCs). Those long-lived compounds, once widely used as refrigerants, were phased out because they damage the ozone layer, but they are still used in various industrial processes. The newly developed material is rich in the element fluorine, which helps it bind CFCs and various other hydro- and fluorocarbon gases very efficiently — to the tune of 75 percent by weight, the chemists say. Although they are less prevalent, the greenhouse effect of those gases can be hundreds- or thousands-fold more powerful than carbon dioxide, the researchers note. Heavier, metal-based materials with similar capabilities have been developed in previous studies, but these were sensitive to water and difficult to process and recycle.
13 Nov 2014:
Global Maps Detail Seasonal and Geographic Trends in Ocean Acidification
A team of scientists has published the most comprehensive analysis yet of how acidity levels vary across the world’s oceans. Drawing on four decades of
Ocean acidification map
measurements, researchers from Columbia University and the University of Colorado mapped changes in ocean acidity by season and location, as well as how acidity levels affect the stability of shell-building minerals. The maps
reveal that the northern Indian Ocean is at least 10 percent more acidic than the Atlantic and Pacific oceans, possibly due to its unique geography, the researchers say. The maps also show that ocean acidity fluctuates most in the colder waters off Siberia, Alaska, Antarctica, and the Pacific Northwest, due to cycles of deep-water upwelling and massive plankton blooms. The oceans have taken up a quarter of the carbon dioxide humans have put in the atmosphere over the last two hundred years, and acid levels at the surface have increased by 30 percent since the beginning of the industrial era, researchers say.
12 Nov 2014:
U.S. and China Announce
Historic Emissions Reduction Pledges
In what could prove to be a momentum-setting piece of diplomacy, the United States and China — which together account for a third of the planet's greenhouse gas emissions — jointly announced
plans to pursue significant cuts in those emissions over the coming 10 to 15 years. Among the details of the joint pledges, unveiled as part of meetings this week between Chinese President Xi Jinping and U.S. President Barack Obama in Beijing, were commitments from the U.S. to cut its CO2 emissions by between 26 percent and 28 percent below 2005 levels by 2025. China, meanwhile, pledged to halt emissions growth by 2030, or earlier, and to increase the nation's share of non-fossil energy sources to roughly 20 percent over the same time frame. The inability of the world's two most consequential economies to agree on an approach to emissions reductions has been a key stumbling block in international climate negotiations for nearly two decades, and the announcement was met with cautious optimism by many climate experts, who characterized it as an important first step toward a global treaty.
11 Nov 2014:
New Mapping Tool Highlights
Carbon-Trapping Forests in Peru
A new, high-resolution mapping technique can be used to help identify and prioritize tracts of forest land with the highest
Map of carbon storage potential of land in Peru
carbon-sequestering potential, according to research published in the Proceedings of the National Academy of Sciences
. In the study, researchers with the Carnegie Institution for Science applied the technique, which integrated satellite imaging data and advanced, three-dimensional forest mapping information, to the 128 million hectares that comprise the nation of Peru. The analysis considered each landscape's unique climate, topography, geology, and hydrology to produce a map showing a range of landscapes with varying carbon densities — a potentially crucial tool as nations prepare to negotiate global forest protections as part of United Nations climate talks next month Lima, Peru.
10 Nov 2014:
Public Views of Climate Science Hinge on Solutions, New Study Finds
People often evaluate scientific evidence not on the basis of its perceived merits, but on whether they agree with the policy implications of the research, according to a study published in the Journal of Personality and Social Psychology
. Using issues like climate change and air pollution as test cases, Duke University researchers sought to determine if what they call a "solution aversion" bias could be detected among self-identified Republican or Democratic survey participants. In one example, participants were provided a scientific assertion that global average temperatures could rise as much as 3.2 degrees by the end of the century, after which they were presented with potential policy solutions. If that solution involved government regulation or increased taxes, just 22 percent of Republican participants expressed confidence in the initial scientific finding. But if the solution emphasized using market forces to curb temperatures, the percentage of Republicans accepting the initial temperature predictions rose to 55 percent. Self-identified Democrats displayed no difference in the same experiment, but liberal biases were clearly elicited on other issues, the researchers found.
05 Nov 2014:
Norway Best Prepared Nation
For Climate Change, Global Index Shows
Norway is the best prepared country for climate change, and has been so for almost 20 years, according to
compiled by the University of Notre Dame. New Zealand, Sweden, Finland, and Denmark rounded out the top five, while Chad, Burundi, Eritrea, Central African Republic, and Congo make up the bottom of the Global Adaptation Index. The rankings highlight the disparities between the world’s relatively wealthy, developed nations and its developing economies when it comes to dealing with climate change. Many of the highest ranking countries do face moderate exposure to climate change, the researchers said, but access to amenities such as electricity, sanitation, clean drinking water, and functional governance have left them better prepared. The economies of many developing countries, however, depend on natural resources, which makes their political and economic stability more susceptible to climate change. The index ranked 178 countries on their vulnerability and readiness to adapt to natural disasters associated with global warming.
03 Nov 2014:
Climate Impacts To Be Severe and Irreversible Without Emission Cuts, UN Says
Climate change will have “severe, widespread, and irreversible impacts” on society and the environment
The U.N. climate panel's synthesis report was released on November 2.
unless nations swiftly and drastically cut carbon emissions — a goal that, while difficult, still remains within reach, according to a comprehensive new United Nations climate report released this week. Failure to curb emissions by the end of the century will likely lead to food shortages, refugee crises, the flooding of major coastal cities and entire island nations, and dangerous yet routine heat waves, among other impacts, the analysis concluded. But the panel also said for the first time that combating climate change is economically feasible. The new U.N. report synthesizes the findings from a series of analyses released over the past year by the Intergovernmental Panel on Climate Change — the panel's first major update since 2007.
29 Oct 2014:
Weather and Climate Key in Weights of Penguin Chicks, Researchers Say
Local weather and large-scale climate trends have the largest impact on the weights of Adélie penguin chicks
An adult Adélie penguin feeds its chick.
— not food availability — according to
researchers at the University of Delaware. Adélie penguins are native to the West Antarctic Peninsula, and their habitat is warming faster than most other parts of the planet. Looking at records dating back to 1987, scientists found that year-to-year changes in local weather — including wind speed, temperature, rain, and humidity — could cause chicks’ weights at the time they leave their nests to fluctuate by up to 7 ounces. That’s often the difference between a surviving and non-surviving chick, the researchers say. Biologists previously thought that food sources and parenting played the largest role in chicks’ health, but these findings
suggest that exposure to elements is more important. The study "calls into question what happens to an ecosystem when you change climate quickly," principal investigator Matthew Oliver said.
21 Oct 2014:
Desert and Mediterranean Plants
More Resistant to Drought than Expected
Desert and Mediterranean ecosystems may be more resistant to climate change, particularly long-term
Plants in a Mediterranean ecosystem in Chile.
drought, than previously thought, a new study published in Nature Communications
shows. Over the course of a nine-year experiment, researchers subjected plants in four different climatic zones to rainfall conditions predicted under future climate change scenarios. The ecosystems typically received 3.5 to 30.7 inches of precipitation annually, and researchers cut that total by roughly 30-percent to simulate drought conditions. Surprisingly, the researchers found no measurable changes in plant biomass, density, or species composition and richness in any of the four ecosystems over the course of nine generations of plants. The ecosystems already receive highly variable amounts of rainfall and the 30-percent drop likely falls within the plants’ natural "comfort zone," the researchers say, which could explain the unexpected resilience to drought.
20 Oct 2014:
Electricity Access Has Small
Effect on Emissions in India, Study Says
Expanding electricity to the homes of 650 million people in India over the past 30 years had minimal
A third of all households in India lack electricity.
direct impact on the country’s greenhouse gas emissions, according to a study published in Nature Climate Change
. Although many humanitarian and development organizations have stressed the importance of improving electricity access in low-income countries, it has been unclear how this would impact overall emissions levels. An analysis of trends in India between 1981 and 2011 shows that expanding household electricity access by roughly 45 percent contributed only 3 to 4 percent to the nation's overall growth in carbon dioxide emissions. When the indirect effects of greater electricity access, such as increased wealth and consumerism, are taken into account, household electricity use raised India’s emissions by 11 to 25 percent over that period, the study found.
16 Oct 2014:
Global Boom in Natural Gas
Unlikely to Help the Climate, Study Suggests
Increasing global supplies of unconventional natural gas will not help to reduce the overall upward trajectory of greenhouse gas emissions and the planetary warming that comes with it, according to a new study
published in the journal Nature
. The findings further undercut the notion, long touted by proponents of natural gas, that the fuel — which emits less CO2 than coal when burned — represents an important "bridge" in the transition to low-carbon energy resources. The study, which synthesized models developed by numerous researchers working independently, suggested atmospheric greenhouse gas concentrations over the next 35 years would remain virtually unchanged — and in some models, warming would be worsened — by increased natural gas production. This was in part attributed to the fact that the new gas supplies would provide a substitute not only for coal, but also for low-emissions technologies like nuclear power and renewables.
15 Oct 2014:
U.S. Climate Envoy Says All
Nations, Rich and Poor, Must Curb Emissions
The negotiating architecture that has governed the decades-long pursuit of an international climate
Climate Envoy Todd Stern
agreement is outdated, said Todd Stern, the U.S. special envoy for climate change at the State Department and the nation’s lead climate negotiator. In remarks delivered at Yale University’s Law School on Tuesday, Stern reiterated the U.S. position
that all nations — both rich ones and developing ones — must be brought together under one agreement that includes pledges to cut emissions. "This split between developed and developing countries in the climate convention is the singular fault line in these negotiations," Stern said, "and has been from the beginning." Under the recently expired Kyoto protocol, developing countries like China and India were exempted from committing to emissions cuts. Climate talks are scheduled to resume in Lima, Peru later this year, with a goal of achieving a new and fully global treaty at a meeting in Paris in 2015. That pact, Stern argued, ought to require all nations to submit emissions reduction targets, tailored as needed to national interests and abilities.
14 Oct 2014:
Researchers Explain Puzzling
Stability of Some Himalayan Glaciers
Unlike nearly all other high-altitude glaciers across the globe, glaciers in the Karakoram mountain chain, part
Baltoro Glacier in the Karakoram range
of the Himalayas, are not melting and are even expanding in some areas. This so-called “Karakoram anomaly” has puzzled scientists for years, but now a team of researchers has offered an explanation
: While rain from warm summer monsoons tends to melt mountain glaciers in other parts of the Himalayas and the nearby Tibetan Plateau, the location and height of mountains in the Karakoram chain, which runs along the borders of China, India, and Pakistan, protect the area from this seasonal precipitation. Instead, the mountain chain receives most of its precipitation in the form of winter snowfall, according to findings published in Nature Geoscience
. The study suggests that the Karakoram glaciers are likely to persist until 2100, but not long after, if global warming continues at its current pace.
E360 Video Winner: Intimate Look
“Peak to Peak,”
At the Bighorn Sheep of the Rockies
the third-place winner of the Yale Environment 360 Video Contest, focuses on a herd of bighorn sheep in Montana and features remarkable scenes of lambs as they gambol along the slopes of the northern Rockies. Produced by Jeremy Roberts, the video follows a field biologist as he monitors the sheep and talks about the possible impact of climate change on the animals’ future.
Watch the video.
13 Oct 2014:
Climate Change To Make Many
Fish Species Extinct in Tropics, Study Says
Climate change is likely to drive fish and marine invertebrates toward the poles and cause extinctions
near the tropics, according to
researchers at the University of British Columbia. Under the conservative climate change scenario of one degree Celsius of warming by 2100, the 802 species modeled in the study
are predicted to move away from their current habitats by as much as 9 miles, or 15 kilometers, every decade — a rate similar to what scientists have observed over the past few decades. Under the worst-case scenario of three degrees of warming, the researchers predict marine species will move toward the poles at a rate of 26 kilometers per decade. Under that scenario, an average of 6.5 species per 0.5 degrees of latitude would become locally extinct closest to the equator. The shifts will be caused by the species' reactions to warming waters, changing ocean chemistry, and ecosystem structure near the tropics, as well as new habitats opening up nearer the poles, researchers say.
10 Oct 2014:
Natural Gas Production Causing
Large Methane Hotspot Over U.S. Southwest
A single methane “hotspot” in the U.S. Southwest accounts for 10 percent of the nation’s total estimated
Coalbed natural gas field in northwest New Mexico
methane emissions, according to an analysis
by researchers at the University of Michigan and Caltech. The area is centered in New Mexico's San Juan Basin near the shared borders of Colorado, Utah, and Arizona — the site of the largest and most active coalbed natural gas production operation in the U.S. Natural gas from the basin is more than 95 percent methane, a significantly more potent heat-trapping gas than carbon dioxide. Satellite measurements collected over seven years showed natural gas production operations in the area released roughly 650,000 tons of methane to the atmosphere each year. The methane emissions are not associated with hydraulic fracturing operations in the region, which began after the measurements were collected.
08 Oct 2014:
Floods Will Be Chronic Problem
For East Coast Cities by 2030, Study Says
By 2030, residents of Washington, D.C., and Annapolis, Maryland, could be experiencing more than 150 tidal floods every year — up
from an average of just 50 today — according to a recent study of sea level rise and coastal flood risk along the U.S. East Coast by the Union of Concerned Scientists
. In another 15 years, that number could jump to 400 floods annually, the study says. A home purchased in some of the more flood-prone parts of those two cities could see daily flooding before a 30-year mortgage was paid off, according to the study. The increased frequency will be driven by sea level rise, researchers say, which exacerbates the effects of so-called “nuisance flooding” linked to tidal cycles, rainfall, and storm surges. Other cities on the Atlantic coast will also see increased flood frequency, including Miami and Atlantic City, New Jersey, which can expect an average of 240 flood days per year by 2045.
Interview: A Call for Climate Goals Other Than Two Degrees Celsius
When international delegates meet in Paris next year to negotiate a new climate agreement, they'll be aiming to keep the global average temperature from rising more than 2 degrees
Celsius above pre-industrial levels, the maximum seen by many for avoiding the worst impacts of climate change. But David Victor, a professor of international relations at University of California San Diego, argued in a recent controversial commentary in Nature
that the 2-degree goal is now unattainable and should be replaced by more meaningful goals. In an interview with Yale Environment 360
, Victor explains why he believes the 2-degree threshold has failed to position policy makers to take serious action on climate change and outlines the "basket of indicators" that he and his co-author are suggesting be used instead. Read the interview.
07 Oct 2014:
Deep Oceans Not Warming As Previously Thought, Study Finds
The deepest reaches of earth's oceans have not warmed significantly over the last decade, according to scientists at NASA's Jet Propulsion Laboratory in California
— a finding that undermines a leading theory as to why the pace of global warming has slowed over the last 15 years. Scientists have speculated that the recent slowdown in rising surface air temperatures was a result of heat accumulating in the deep ocean. But in a paper
published in the journal Nature Climate Change
, the NASA researchers concluded that the vast majority of sea level rise since 2005 was attributable to just two sources: upper ocean heat expansion and glacial melting. From this they inferred that the deep ocean was not also warming. In a separate paper
published in the same journal, however, scientists from the Lawrence Livermore Laboratory noted that the upper ocean was absorbing between 24 and 58 percent more heat than was previously thought. That's not enough to account for the pause in surface air warming, but the researchers suggest
it is evidence that more accurate data on ocean warming is needed.
06 Oct 2014:
Number of Megacities Has
Nearly Tripled Since 1990, UN Report Says
The number of urban areas with more than 10 million inhabitants — sometimes called "megacities" — has
nearly tripled in the last 24 years, jumping from 10 in 1990 to 28 in 2014, according to the latest UN report on world urbanization
. The total number of people living in megacities has grown from 153 million to 453 million during that period, the report says, and such areas now account for 15 percent of global GDP. Although densely populated urban areas can be environmental blights, innovations in efficient transportation have arisen from some major cities in Asia and Lagos, Nigeria, because those cities have invested heavily in public transit infrastructure, researchers say
02 Oct 2014:
Large Sediment Plumes Flowing
From Greenland Glaciers, Images Show
Plumes of sediment-laden meltwater from southwest Greenland’s glaciers are easily recognizable in this
NASA satellite image
Sediment plumes off the coast of Greenland
captured in early September. Meltwater at the top of the ice sheet starts out relatively clean, but as it flows through glacial channels down to the ground and out into the ocean, it picks up large amounts of sediment — a byproduct of the glacier scraping the bedrock. As a result, plumes like the ones that appear light-blue in this photograph, are good markers for estimating the amount of meltwater leaving the ice sheet, researchers say. Melting from the Greenland Ice Sheet could result in global sea level rise of 2 to 8 inches, according to the most recent assessment from the Intergovernmental Panel on Climate Change.
01 Oct 2014:
Scientists Photograph Gathering
Of 35,000 Walruses on Alaskan Beach
In one of the largest gatherings of walruses documented in recent years, Alaska biologists photographed a
congress of roughly 35,000 animals resting on a beach
in northwestern Alaska. They swam to shore to rest, a walrus researcher explained, after the last remaining traces of sea ice melted in mid-September. Walruses typically rely on sea ice to provide a platform for resting and caring for their young as they swim to find clams, worms, and shrimp offshore, near the edge of the continental shelf. When no sea ice is available, as has been the case in the Chukchi Sea six of the last eight years, the walruses must make their way to shore. Besides taking them farther from their feeding grounds, the beach gatherings are dangerous for young walruses because they can be trampled, biologists say. The U.S. Fish and Wildlife Service is considering granting Endangered Species Act protections to Pacific walruses.
26 Sep 2014:
Aral Sea Basin Dry for First
Time in Modern History, Images Show
For the first time in modern history, the eastern basin of the South Aral Sea has gone completely dry, as this
NASA satellite image
captured in late August shows. The Aral Sea is an inland body of water lying between Kazakhstan and Uzbekistan in central Asia. It was once one of the four largest lakes in the world, but it has been shrinking markedly and dividing into smaller lobes since the 1960s, after the government of the former Soviet Union diverted the region's two major rivers to irrigate farmland. One Aral Sea researcher suggested that it has likely been at least 600 years since the eastern basin entirely disappeared. Decreasing precipitation and snowpack in its watershed led to the drying this year, and huge withdrawals for irrigation exacerbated the problem. Water levels are expected to continue to show major year-to-year variations depending on precipitation and snowpack levels, the researcher said.
24 Sep 2014:
Nations Announce Agreement
To End Forest Loss by 2030 at UN Summit
The U.S., Canada, and the European Union agreed at yesterday's UN climate summit to cut global
Deforestation for palm oil in Malaysian Borneo
deforestation in half by the end of the decade and eliminate net forest losses entirely by 2030, marking the first time such a deadline has been set. If the goal is met, it will cut carbon emissions by an amount equal to taking 1 billion vehicles — every car on the planet — off the road, the UN said
. Notably missing from the list of committed countries was Brazil, which has been a key player in Amazon deforestation, because of concerns that the pledge would clash with national laws permitting managed deforestation. Critics say ending deforestation is nearly impossible without Brazil's cooperation. In addition to the 32 national governments that signed onto the declaration, 35 corporations, including Kellogg's, L'Oreal, and Nestle, pledged to support sustainable forest practices in their supply chains.
23 Sep 2014:
Food Security Issues Often
Neglected After Extreme Weather Events
Extreme weather events — the sort likely to arise with increasing frequency as the planet warms — took a heavy toll on Russia and East Africa in 2010 and 2011, in large part because governments and authorities were ill-equipped to address resulting food shortages and other fallout, according to researchers at the University of Oxford. Russia experienced a heat wave that led to food hoarding and price-fixing of staple crops by speculators, according to the report, which was commissioned by Oxfam
. A drought in East Africa in 2010 through 2011 was tied to an uptick in armed conflicts in the region, which interrupted international and domestic aid for six months. Crop prices reached record levels in several markets, including wheat in Ethiopia, maize in Kenya, and red sorghum grain in Somalia, the report notes. Investing in additional health facilities, establishing pre-positioned food supplies, and other tactics aimed at mitigating the effects of future heat waves, droughts, and floods, could help to blunt the effects of climate change on the poorest and most vulnerable populations, the researchers say.
22 Sep 2014:
Planet Set to Reach CO2
Threshold in 30 Years, Researchers Say
Only 1.2 trillion metric tons of carbon dioxide can be emitted in the future if nations are to avoid causing the
global mean surface temperature to rise more than 2 degrees C beyond the pre-industrial average, according to
researchers with the Global Carbon Project
. Combined historical and future carbon dioxide emissions must remain below 3.2 trillion metric tons to have a 66-percent chance of keeping that temperature increase below 2 degrees C — the internationally accepted benchmark for restraining global warming. But two-thirds of this allotment has already been emitted, and at the current pace of emissions, the global population will burn through the rest within the next 30 years, the researchers conclude. CO2 emissions rose 2.3 percent in 2013 and are on track to increase by 2.5 percent in 2014, according to the report, which was released ahead of this week's UN climate summit.
19 Sep 2014:
Global Population on Track to
Reach 11 Billion by 2100, Researchers Say
A new analysis of United Nations global population data finds an 80-percent probability that the number of
people in the world, now 7.2 billion, will increase to between 9.6 and 12.3 billion in 2100. Published in the journal Science
, the study counters the widely accepted projection that global population will peak at roughly 9 billion by 2050, then gradually decline. The new study instead finds a 70-percent likelihood that population will grow continuously throughout the century to reach 10.9 billion by 2100. Researchers attribute the higher projections, in part, to increasing fertility rates in sub-Saharan Africa, where population growth had been predicted to continue slowing. The Guardian
notes that many widely cited global policy assessments, such as recommendations from the Intergovernmental Panel on Climate Change, assume a population peak by 2050.
18 Sep 2014:
Trees Growing Significantly
Faster in Warming Climate, Study Finds
An analysis of data spanning 140 years from one of the world's oldest forest study sites indicates that trees have
Collecting growth ring samples from study site
been growing significantly faster and stands have become larger since the 1960s. The study, published in Nature Communications
, was based on 600,000 individual tree surveys conducted since 1870 at a central European forest study site. European beech and Norway spruce, the dominant tree species in the experimental plots, grew 77 and 32 percent faster, respectively, than they did 50 years ago, the analysis found. The trends are primarily due to rising temperatures and longer growing seasons, the researchers say, although increasing carbon dioxide and nitrogen levels in the atmosphere could also play a role. The stages of tree development haven't changed, the researchers say; instead, trees are moving through their development trajectory much faster than before. The changes could affect other plants and animals in the forest ecosystem that rely on specific phases of forest development, the study notes.