Pope Francis will speak to the United Nations General Assembly on Sept. 25 about poverty, the environment, and sustainable development. In a Yale Environment 360 forum, seven leading thinkers on the environment and religion describe what they would like to hear the pope say.

At the upcoming U.N. climate conference, most of the world’s major nations will pledge to make significant reductions in greenhouse gas emissions. But serious doubts remain as to whether these promised cuts will be nearly enough to avoid the most severe impacts of climate change.

More than half a century after scientist Rachel Carson warned of the dangers of overusing the pesticide DDT, conservative groups continue to vilify her and blame her for a resurgence of malaria. But DDT is still used in many countries where malaria now rages.

An astonishing 18 percent of the European Union’s land area is protected under a network of preserves known as Natura 2000. Now, at the urging of business interests and farmers, the EU is examining whether regulations on development in these areas should be loosened.

Is it 150 species a day or 24 a day or far less than that? Prominent scientists cite dramatically different numbers when estimating the rate at which species are going extinct. Why is that?

A Yale Environment 360 video goes onto the front lines with Colorado fire crews who have watched as massive, months-long wildfires have become a regular occurrence in their state.

With the world’s coral reefs increasingly threatened by warmer and more acidic seas, scientists are selectively breeding corals to create species with the best chance to survive in the coming century and beyond. Are genetically modified corals next?

The fossil fuel divestment campaign has so far persuaded only a handful of universities and investment funds to change their policies. But if the movement can help shift public opinion about climate change, its organizers say, it will have achieved its primary goal.

Alien rats introduced by ships are decimating populations of birds and other wildlife on islands from the sub-Antarctic to California. Effective programs to eradicate the rats are underway but are encountering opposition from animal activists and some green groups.

Marijuana growers are ravaging forests in northern California to produce their lucrative crop. In a Yale Environment 360 interview, biologist Mary Power talks about the massive ecological footprint of marijuana growing and why nationwide legalization could help alleviate it.

As climate change puts ecosystems and species at risk, conservationists are turning to a new approach: preserving those landscapes that are most likely to endure as the world warms.

Norwegian psychologist Per Espen Stoknes has studied why so many people have remained unconcerned about climate change. In a Yale Environment 360 interview, he talks about the psychological barriers to public action on climate and how to overcome them.

A recent battle over imposing a “climate fee” on coal-fired power plants highlights Germany’s continuing paradox: Even as the nation aspires to be a renewable energy leader, it is exploiting its vast reserves of dirty brown coal.

Former Environment Minister Jairam Ramesh believes the “cult” of unfettered economic growth has been ruinous for India’s environment. In an interview with Yale Environment 360, he talks about his vision of “green growth,” which he says is essential for his nation’s future.

The flood that swept through the Indian state of Uttarakhand two years ago killed thousands. Now researchers are saying that melting glaciers and shifting storm tracks played a major role in the disaster and should be a warning about how global warming could lead to more catastrophic floods in the future.

The record-breaking drought in California is not chiefly the result of low precipitation. Three factors — rising temperatures, groundwater depletion, and a shrinking Colorado River — mean the most populous U.S. state will face decades of water shortages and must adapt.

No nation has as high a penetration of residential solar as Australia, with one in five homes now powered by the sun. And while the government has slashed incentives, solar energy continues to grow, thanks to a steep drop in the cost of PV panels and the country’s abundant sunshine.

As the U.S. and Russia take the first steps to drill for oil and gas in the Arctic Ocean, experts say the harsh climate, icy seas, and lack of infrastructure means a sizeable oil spill would be very difficult to clean up and could cause extensive environmental damage.

Officials in the Florida Keys are seeking to use a GM mosquito that could help prevent a recurrence of dengue fever there. But fears among some residents — which scientists say are unfounded — are slowing the release of mosquitoes whose offspring are genetically programmed to die.

The Sierra Club has chosen Aaron Mair as its president, the first African-American to lead the largest U.S. environmental organization. In an interview with Yale Environment 360, he talks about the lack of diversity in the environmental movement and what can be done to change that.