17 Sep 2014:
Shift to Mass Transit Could
Have Major Economic and Climate Benefits
Expanding public transportation and infrastructure that promotes walking and biking throughout the world's
cities could save $100 trillion and cut transportation-related carbon emissions by 40 percent by 2050, according to
an analysis by researchers at the University of California, Davis, and the Institute for Transportation and Development Policy. Urban transportation-related emissions could double by 2050 as growth continues in major cities in China, India, and other developing countries. But if China alone were to develop extensive bus rapid transit and commuter transit networks, its predicted transportation-related emissions in 2050 could be cut by 40 percent, the analysis found. The U.S. — currently the world's largest contributor to urban transportation-related emissions — is seeing declines in that sector as population growth slows, vehicle fuel efficiency improves, and people drive less. But those emissions cuts could accelerate sharply if urban mass transit were improved, the report said.
16 Sep 2014:
Tackling Climate Change Could
Pay Off in as Little as 15 Years, Report Finds
Limiting greenhouse gas emissions globally over the next 15 years is both economically feasible and likely to save money, according to a new report
from the Global Commission on the Economy and Climate. Between 2015 and 2030, nations are expected to invest roughly $90 trillion in urban land-use and energy infrastructure, the analysis estimated. Steering those investments toward renewable energy, efficiency improvements, and other low-emission technologies would make that global investment more costly, the panel of government and business leaders conceded. But these costs could eventually be offset by the lowered operating costs associated with renewable power, the report suggested. Although they are difficult to quantify, health care savings associated with improved air quality would also offset costs. According to the report, the biggest challenges for governments will be enacting stronger rules and policies that favor low-carbon development, such as cutting the $600 billion currently spent on fossil fuel subsidies.
Interview: Making Farm-to-Table
A Truly Sustainable Movement
Renowned chef Dan Barber is synonymous with the farm-to-table movement. His two New York restaurants
feature organic ingredients grown or raised on nearby farms, including the one that surrounds his Hudson Valley restaurant. So it’s striking that in his new book, The Third Plate
, Barber maintains that the movement he has been championing hasn’t gone far enough. In an interview
with Yale Environment 360
, Barber says if the farm-to-table movement is to truly support sustainability, end the rise of monocultures, and produce delicious food, it’s the table that must support the farm, not the other way around. And that, he says, calls for a new way of cooking and eating. Read the interview | Listen to a podcast
12 Sep 2014:
New High-Resolution Maps Show
Greenhouse Gas Emissions at City-Level
Researchers have developed a new method for mapping global carbon emissions for individual cities on an
hourly basis — a major improvement over previous techniques, which quantified greenhouse emissions less accurately and at coarser scales, according to researchers at Arizona State University
. The maps are derived from worldwide databases of population, power plants, and national fuel use statistics, and they encompass 15 years of data. Among other findings, the analysis revealed increased emissions in China, India, Europe, and the northern U.S. in 2010, after the peak of the global financial crisis. The researchers say this reflects faster recoveries from the crisis in those regions compared to, for example, the southeastern U.S., where emissions lagged in 2010. The results of the analysis match ground-level measurements, confirming the accuracy of the maps, the researchers say.
11 Sep 2014:
Brazilian Amazon Deforestation
Jumps by 29 Percent, Government Says
Brazilian government data show destruction of the Amazon rainforest increased 29 percent
over the past
year. Satellites documented the deforestation of over 2,300 square miles in the Brazilian Amazon, reversing highly praised gains
in forest conservation since 2004. The largest losses were in the states of Para and Mato Grosso, in central Brazil, which are experiencing widespread agricultural development. The building of new roads and dams, along with illegal logging, also contributed to the rise in deforestation. Brazilian police frequently target illegal logging operations, but environmental groups say more enforcement is needed. Deforestation in Brazil peaked in 2004, when over 11,580 square miles of forest were destroyed. Worldwide, deforestation is responsible for roughly 15 percent of greenhouse gas emissions — more than all types of transportation systems combined.
09 Sep 2014:
Ocean Acidification May Dull
Sharks' Ability to Smell Prey, Study Finds
Ocean acidification, which is driven by rising atmospheric carbon dioxide levels, may cause sharks to
Smooth dogfish shark laboratory testing
be less interested in hunting prey, according to
research published in Global Change Biology
. In laboratory experiments emulating CO2 concentrations as they are expected to be by the middle and end of this century, scientists from the U.S. and Australia found that the smooth dogfish shark became uninterested in squid odors — sometimes avoiding them altogether. Sharks in control waters pursued prey scents four times more often than sharks in waters with high CO2 levels, the study found. Rising ocean acidity can disrupt the proper firing of neurons, the scientists say, because it interferes with a specific receptor present in most marine organisms with a nervous system. A study earlier this year found that fish in waters with increased acidity were also less able to detect predator odors.
08 Sep 2014:
U.S. Dietary Guidelines Would
Lead to Rise in Emissions, Study Says
Following U.S. federal guidelines for a healthy diet is likely to increase greenhouse gas emissions, even though the guidelines recommend a diet with less meat than the average American currently consumes, according to a recent analysis in the Journal of Industrial Ecology
. Compared to U.S. Department of Agriculture dietary guidelines, American's don't eat enough fruits, vegetables, seafood, and dairy, and they consume too much meat, eggs, nuts, soy, oils, solid fats, and added sugars. If the population were to shift its diet to match USDA guidelines, greenhouse gas emissions would actually rise by 12 percent, researchers found, because calories from meat, eggs, fats, and sugars would largely be replaced by dairy products. Methane emissions
from dairy and beef cattle contribute significantly to atmospheric greenhouse gas levels. The findings highlight a need to consider both environmental and health objectives when making dietary recommendations, the researchers say.
Interview: Calling for Moratorium
On Development of Tar Sands Oil
In a recent commentary in Nature
, aquatic ecologist Wendy Palen and seven colleagues were sharply critical of the way that Canada and the United States have gone
about developing Alberta’s vast tar sands deposits and the infrastructure needed to transport those fossil fuels to market. Rather than looking at the cumulative impact of this massive energy development on the climate and the environment, Palen and her co-authors wrote, major decisions have been made in piecemeal fashion. In an interview with Yale Environment 360
, Palen talks about why a moratorium on new tar sands developments is needed, how the decision-making process is biased in favor of short-term economic benefits, why the fate of the proposed Keystone XL Pipeline is critical, and what can be done to begin factoring in the real costs of exploiting the tar sands.
Read the interview.
03 Sep 2014:
Mobile Phone Networks Can
Help Monitor Global Rainfall, Study Says
New research shows
that mobile phone networks, which cover 90 percent of the world's population, can help track rainfall events — a task that has proven difficult for both advanced satellite systems
and ground-level observation networks. By compiling data on signal disruptions from mobile phone networks in Burkina Faso in West Africa, a team of researchers was able to calculate with 95 percent accuracy both the location and volume of rain that fell, even during short-lived storms, according to a report in Geophysical Research Letters
. Mobile phone companies maintain detailed records on signal disruptions, which can occur when water droplets block and deflect signals between antennae, to determine whether their networks are functioning properly. By tapping into those records, researchers could distill data on rainfall events at extremely fine spatial and temporal scales. As mobile phone networks expand across the globe, such data could be used to create highly accurate rainfall maps, researchers say, although gaining access to records could prove difficult.
02 Sep 2014:
Six Strategies Could End
Global Water Stress by 2050, Scientists Say
Global water stress could be alleviated by the year 2050 if countries work to implement six key strategies
ranging from building more reservoirs to controlling population growth, according to
research from Canada and the Netherlands. Water stress is defined as occurring when more than 40 percent of the water from a region's rivers is unavailable because it is already being used — a situation that currently affects roughly one-third of the global population. Writing in Nature Geoscience
, the scientists propose six steps they believe can help reduce water stress: planting crops that use water and nutrients more efficiently; using more efficient irrigation methods; improving the efficiency of water use in homes, industry, and municipalities; limiting the rate of population growth so global population stays below 8.5 billion by 2050; increasing reservoir water storage capacity; and intensifying water desalination operations
27 Aug 2014:
Obama Seeks Climate
Accord Without Congressional Approval
The Obama administration is aiming to forge a legally binding, international agreement that would cut fossil
fuel emissions and direct funds to poor nations dealing with climate change, without ratification from Congress, The New York Times
reports. The agreement would combine legally binding updates to an existing 1992 climate change treaty — allowing Obama to sidestep the constitutional requirement that treaties be ratified by two-thirds of the Senate — with voluntary pledges for specific emissions targets and aid to help poorer countries adapt to climate change. Nations would then be legally required to report progress toward their emissions targets at international meetings that would "name and shame" countries making slow or no progress, the Times
reports. Lawmakers from both political parties say that no climate agreement requiring congressional approval could be reached in the near future. Republican leaders are expected to oppose the agreement being worked on by the administration and say it would be an abuse of executive authority.
25 Aug 2014:
Health Care Savings Can Far
Outweigh Costs of Carbon-Cutting Policies
Implementing policies to curb carbon emissions dramatically cuts health care costs associated with poor air quality — in some cases, by more than 10 times the cost of policy implementation, according to
new research published in Nature Climate Change
. Policies aimed at reducing carbon emissions are as effective as laws targeting polluting compounds like ground-level ozone, also known as smog, and fine particulate matter, the MIT researchers say. An analysis of three climate policies — a clean-energy standard, a transportation policy, and a cap-and-trade program — found that savings from avoided health problems could recoup 26 percent of the cost of implementing a transportation policy, and up to to 10.5 times the cost of implementing a cap-and-trade program. A cap-and-trade program would cost roughly $14 billion to implement, whereas a transportation policy with rigid fuel-economy requirements could cost more than $1 trillion, according to the analysis.
21 Aug 2014:
Antarctica and Greenland
Losing Ice at Fastest Rate Ever Recorded
Ice sheets in Greenland and Antarctica are losing mass at an unprecedented rate of 500 cubic kilometers per
year — enough ice to cover the Chicago metropolitan area with a layer of ice 600 meters thick — according to
German researchers. Using data from the European Space Agency's CryoSat 2 satellite from 2011 to 2014, the team created the most detailed maps to date of ice elevations across Antarctica and Greenland, accurate to a few meters in height. The results reveal that Greenland alone is losing ice volume by about 375 cubic kilometers per year, doubling since 2009, the scientists report. Ice loss in the West Antarctic Ice Sheet has increased by a factor of three over the same period. Combined, the two ice sheets are thinning at the highest rate observed since altimetry satellite records began about 20 years ago, the study found. Data show that East Antarctica is gaining ice volume, but at a moderate rate that doesn’t compensate the losses on the continent's other side.
20 Aug 2014:
Exporting Coal to Korea Could
Slash Emissions by 21 Percent, Analysis Says
Exporting U.S. coal to South Korean power plants could cut greenhouse gas emissions by 21 percent compared to burning it at less efficient U.S. plants, according to
researchers at Duke University
. The strategy could also generate more than $25 billion in economic activity in the U.S. and cut emissions of sulfur dioxide, nitrogen oxide, and particulate matter, the researchers say. For those benefits to occur, however, U.S. plants would need to replace the exported coal with natural gas, and South Korea must use the imported coal to replace dirtier sources of coal. South Korea's coal-fired power plants are newer and significantly more efficient than those in the U.S. — efficient enough to offset emissions associated with shipping the coal across the globe, the researchers say. However, they also caution that further studies are needed to assess the scenario's full environmental impacts, including water use, land use, and the degradation of vital habitats.
18 Aug 2014:
Recent Glacier Losses Are
Mostly Driven by Human Activity, Study Says
Roughly one-quarter of the global glacier mass loss between the years 1851 and 2010 can be attributed to
Artesonraju Glacier in Cordillera Blanca, Peru
human activities, and that fraction increased to more than two-thirds between 1991 and 2010, according to
research published in the journal Science
. The study is the first to document the extent of human contribution to glacier mass loss, which is driven by both naturally caused climate factors, such as fluctuations in solar radiation, and anthropogenic influences. “In the 19th and first half of 20th century we observed that glacier mass loss attributable to human activity is hardly noticeable but since then has steadily increased,” the lead researcher said. The analysis was based on data from the recently established Randolph Glacier Inventory and included all glaciers outside of Antarctica. Changes in glaciers in the Alps and North America were particularly well documented and seem to be definitively influenced by human activities, the researchers said.
13 Aug 2014:
New Maps Show Flooding
Risks for Critical U.S. Energy Facilities
A new mapping tool
shows critical energy infrastructure in the U.S., such as power plants, refineries, and crude oil rail terminals, that may be vulnerable to coastal and
inland flooding, as well as areas that may be prone to flooding in the future. The maps, created by the U.S. Energy Information Administration and the Federal Emergency Management Agency, let users see which energy facilities could be in danger of flooding caused by hurricanes, flash floods, and other weather events, including street-level results for a particular address. The maps show areas that have a 1-in-100 (1 percent) and 1-in-500 (0.2 percent) chance of flooding annually, as well as areas that might be identified in the future as having a 1-percent annual flood hazard.
12 Aug 2014:
Media Still Disproportionately
Including Views of Climate Change Skeptics
Despite strong agreement among a majority of climate scientists that human activities are contributing to
global warming, media coverage still disproportionately includes the views of contrarian scientists, according to
a study published in Environmental Science and Technology
. In a survey of roughly 1,900 scientists, 90 percent of the respondents who had published more than 10 peer-reviewed climate science articles "explicitly agreed with anthropogenic greenhouse gases being the dominant driver of recent global warming." However, when asked how often they were contacted by the media to comment on climate change issues, 30 percent of scientists who view greenhouse gases' impact to be “insignificant or cooling” reported being featured frequently or very frequently in the media, as opposed to 15 percent of scientists who view greenhouse gases as strongly contributing to warming.
11 Aug 2014:
Climate Effects of Keystone XL
Significantly Underestimated, Study Finds
The U.S. State Department's final environmental review of the Keystone XL Pipeline may have underestimated carbon dioxide emissions associated with the pipeline by as much as four times, according to
a new study published in Nature Climate Change
. The addition of Keystone XL crude oil to the market will drive global oil prices down, the authors say, which in turn will increase demand for oil worldwide — by as much as 0.6 barrels for every barrel of Keystone XL oil added to the market. The extra oil consumption could add up to 110 million tons of CO2 to the atmosphere each year, an amount four times larger than the State Department's estimate of up to 27 million tons annually, according to the study. President Obama has said he will let the pipeline proceed only if it will not "significantly exacerbate" greenhouse gas emissions. The State Department's final review determined that the pipeline's effect on climate change would be negligible, but that analysis did not take into account the increase in crude oil demand that could be sparked by Keystone XL, the authors of the new study say.
08 Aug 2014:
China Added Large Amount
Of Solar Power in First Half of 2014
In the first half of 2014, China added 3.3 gigawatts of solar power — as much as is installed in the entire
Distributed solar in Kunming, China
continent of Australia — China's National Energy Administration reports
. The country now has 23 gigawatts of solar power installed, which is nearly twice that of the United States. China, the world's largest carbon emitter, has set a goal of 35 gigawatts of installed solar power by the end of next year. The nation's push toward solar energy will include distributed solar, such as rooftop and ground-mounted installations near homes and municipal buildings, Chinese officials say, and the government could announce distributed solar incentive programs later this month, Bloomberg News reports. Renewable energy, especially solar, has become a high priority for the Chinese government as major cities and industrial areas have experienced choking air pollution. Earlier this week, officials announced that Beijing would ban coal use by 2020.
06 Aug 2014:
Western U.S. In Its Quietest
Fire Season In A Decade, Officials Report
The western U.S. is in the midst of its quietest wildfire season
in a decade, according to data from the National
Interagency Fire Center (NIFC). With 1.7 million acres burned through August 4, the 2014 fire season has destroyed well below the average of 4.4 million acres for the previous nine years through the same date. Fire season still has a few months left, however, and the year's good fortune may not last: Above normal fire potential is expected to continue
over most of California, Nevada, Oregon, Washington, and Idaho, according to the NIFC. Average temperatures have been 2 to 4 degrees above normal for most of the West; portions of the western Great Basin, northern California, and Pacific Northwest were 6 to 8 degrees warmer than normal; and exceptional drought conditions continue in California, western Nevada, and the Texas Panhandle, the center says.
05 Aug 2014:
Forests Already Seeing Effects of
Climate Change, European Researchers Say
Damage from wind, bark beetles, and wildfires has increased drastically in Europe's forests in recent years, and climate change is the driving factor, according to
research published in Nature Climate Change
. These disturbances have become increasingly acute over the last 40 years, damaging 56 million cubic meters of timber per year from 2002 to 2010. And researchers estimate that an additional million cubic meters of timber — roughly 7,000 soccer fields of forest — will likely be destroyed each year over the next 20 years if climate change trends continue. Damage from forest fires in particular is expected to increase on the Iberian Peninsula, while bark beetle damage will likely increase most strongly in the Alps. Wind damage is predicted to rise most notably in Central and Western Europe, the study found. To compound the problem, as more forests are damaged, there will be fewer healthy trees available to remove the climate-warming carbon dioxide from the atmosphere, the researchers note.
31 Jul 2014:
U.S. Public and Congress Similarly
Split on Environmental Spending, Study Says
American citizens are increasingly divided over the issue of environmental protection and seem to be taking their cue primarily from Congress, according to
new research from Michigan State University. The gap between conservatives who oppose environmental protection and liberals who support it has risen drastically in the past 20 years, the study found. A national poll from 2012 (the most recent data in the study) with a question on environmental spending indicated that 68 percent of Democrats believe the country has spent too little on the environment, versus only 40 percent of Republicans. The polling data, which reach back to 1974, indicate the gap started growing particularly wide in 1992, a year after the fall of the Soviet Union. At that point, the researchers say, the conservative movement replaced the “Red Scare” with the “Green Scare” and became increasingly hostile toward environmental protection, a trend amplified in recent years by the Tea Party.
30 Jul 2014:
New Maps of Peru Forests
Could Help Set Conservation Priorities
New, highly detailed maps of Peru's vegetation show that three-quarters of the country's forests — a biomass
stock that sequesters more carbon than the combined annual CO2 emissions of the U.S. and China — lie outside of protected areas and are vulnerable to deforestation, according to
an analysis by researchers in the U.S. and Peru. The maps, which should prove helpful to scientists, conservationists, and policymakers working to protect the forests, offer the most detailed view to date of the different types of vegetative cover and above-ground carbon stocks across Peru, with resolution at the one-hectare scale. The analysis found that the lowlands of southern Peru, which contain extensive bamboo cover, harbor significantly less carbon than other rainforest areas, and forests in active floodplains appear to store half as much carbon as other forests.
25 Jul 2014:
Southwestern U.S. Aquifers
Are Extremely Low, NASA Data Show
Groundwater reserves in the U.S. Southwest are severely low and prospects for their long-term viability are bleak as persistent drought continues to parch the
land and prevent recharging, according to an assessment from NASA
. As shown in this map, many underground aquifers in the Southwest are extremely dry compared to average conditions over the past 60 years. Deep red areas on the map, such as in southern California and Nevada, depict aquifers that are so dry there's less than a 2 percent chance they could have experienced such levels of drought-related depletion since 1948. Although the Pacific Northwest is experiencing drought-related wildfires, its aquifers appear to be well-stocked, according to the map. The discrepancy is likely due to the long lag between dry conditions at the surface and depletion of groundwater reserves, researchers say.
24 Jul 2014:
Protecting Community Forests
Is a Major Tool in Climate Fight, Study Says
Expanding and strengthening the community forest rights of indigenous groups and rural residents can make a major contribution to sequestering carbon and
The Brazilian Amazon
reducing CO2 emissions from deforestation, according to a new report
. The World Resources Institute
(WRI) and the Rights and Resources Initiative
said that indigenous people and rural inhabitants in Latin America, Africa, and Asia have government-recognized rights to forests containing nearly 38 billion tons of carbon, equal to 29 times the annual emissions of all the world’s passenger vehicles. By enforcing community rights to those forests
, the study said, governments can play a major role in tackling climate change. In the Brazilian Amazon, for example, deforestation rates are 11 times lower in community forests than in forests outside those areas. In areas where community forest rights are ignored, deforestation rates often soar. The report made five major recommendations, from better enforcement of community forest zones to compensating communities for the benefits their forests provide.
23 Jul 2014:
Earth Observation Satellites Help
Scientists Understand Global Change
Global warming is affecting more than just atmospheric temperatures — it is also changing water cycles
, soil conditions, and animal migrations. Earth observation satellites aid scientists in measuring and monitoring these changes so societies can better adapt. Although there are well over 1,000 active orbiting satellites, less than 15 percent are used to monitor Earth’s environment. Yale Environment 360
presents a gallery of satellites that scientists are using to better understand how the planet is changing.
View the gallery.
16 Jul 2014:
Politics and Education Affect
When People Search for Climate Information
People across the United States search the Internet for information on climate change when they experience unusual or severe weather events, but the timing of their searches differs based on political ideology and education levels, according to
research published in the journal Climatic Change
. An analysis of Google searches and weather patterns between 2004 and 2013 found that Democratic-leaning regions and those with higher education levels were more likely to seek information about climate change when average summer temperatures were above normal, whereas those in Republican and less educated areas sought climate change information when they experienced extreme heat. Searches peaked during weather consistent with climate change as well as during cold snaps, the study found. This could indicate that people who observe unusual extreme weather conditions are genuinely interested in learning more about climate change, or that climate deniers, when experiencing unusually cool weather, go online to confirm their skeptical views, the researcher speculated.
Five Questions for Jeffrey Sachs
On Decarbonizing the Economy
Thirty scientific institutions from 15 countries recently released a report for the United Nations outlining how
the world’s major carbon dioxide-emitting nations can slash those emissions by mid-century. Called the Deep Decarbonization Pathways Project
, the initiative aims to provide leaders with a plan of action in advance of a UN summit in September and climate negotiations in Paris in late 2015. Yale Environment 360
asked Jeffrey Sachs, director of Columbia University’s Earth Institute and a key player in the decarbonization project, five questions about the initiative and the prospects for global action on the climate front.
14 Jul 2014:
Human Activity Has Caused
Long-term Australian Drought, Model Shows
A new high-resolution climate model shows that southwestern Australia's long-term decline in fall and winter rainfall, which began around 1970 and has increased over the last four decades, is caused by
increases in man-made greenhouse gas emissions and ozone depletion, according to
research published in Nature Geoscience
. Simulating both natural and man-made climate effects, scientists showed that the decline in rainfall is primarily driven by human activity. Rises in greenhouse gas emissions and thinning of the ozone hole have led to changes in large-scale atmospheric circulation, including a poleward movement of the westerly winds and increasing atmospheric surface pressure over parts of southern Australia. This has led to decreased rainfall, the study said. The drying is most severe over southwest Australia, where the model forecasts a 40 percent decline in average rainfall by the late 21st century, with significant implications for regional water resources.
07 Jul 2014:
A Strong Rebuke for Paper
That Forecasted `Climate Departure’
Thirteen climate scientists and meteorologists have published a sharp criticism
of a paper
by University of Hawaii biogeographer Camilo Mora, who calculated dates when earth’s climate will move into a new state caused by human-driven global warming. Mora and his ideas were featured in an interview
last week at Yale Environment 360
. In a comment article in Nature
, the 13 scientists say that Mora and his colleagues used faulty methodology that produced artificially early dates when specific regions would reach “climate departure.” They also said Mora underestimated the uncertainty involved in forecasting the time of emergence of a new climate regime. “This overconfidence could impair the effectiveness of climate risk management decisions,” the 13 scientists said in their comment. In his own comment
, Mora defended his methods, saying, “Our findings are conservative and remain unaltered in the light of their analysis.”