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After the attacks, barriers and thigh-high cement bollards sprouted up seemingly overnight in Washington, D.C. But new threats show the need for adaptability.

As secretary of the treasury from 2006 to 2009, Henry Paulson grappled firsthand with the U.S. financial crisis. He says he sees a similar pattern now developing related to climate change: mounting excess, flawed policies and unheeded warnings. For that reason, Paulson is working to convince his fellow Republicans and the American business community that a carbon tax is not only a wise move, but a critical one.

The new rule is intended to decrease the use of greenhouse gases known as hydrofluorocarbons by 85% over the next 15 years. The gases that are thousands of times more powerful than carbon dioxide.

For the first time, scientists have shown that a new kind of genetic engineering can crash populations of malaria-spreading mosquitoes.

On Tuesday, countries at the global climate summit COP26 pledged to cut back on heat-trapping methane emissions and do more to fight deforestation.

The principal of a Miami middle school that artists adorned with murals two years ago says the art has led to better attendance and enrollment. This year, it's an elementary school's turn for murals.

Using the energy of audience-powered generator bikes for live shows, the Virginia duo connect to their audience and the Earth.

In 1940, author John Steinbeck and his friend Ed Ricketts, a marine biologist, sailed to the Sea of Cortez to document wildlife. Now scientists are re-tracing their route. The Radio Expeditions series joins them.

Even as coal plants shut down, they leave behind massive piles of toxic coal ash. About half that coal ash is unregulated, and environmental groups want the Biden administration to change that.

To prepare for more development, lawmakers in Florida are commissioning new toll roads through rural areas. But some rural communities say they don't want them.