The whale has not been seen for days, lessening the chances scientists can find and disentangle it.

Nashua, N.H., expects to be a destination for people migrating away from the coasts and toward lower temperatures. Officials say a pandemic influx has shown the need to plan for that growth.

"For the first time in history, nuclear weapons are going to be illegal in international law," says Elayne Whyte, who oversaw the treaty's creation.

In rich countries, every sector of the economy reduced its contribution to climate change last year — with one big gas-guzzling exception.

This likely means the end of the $8 billion pipeline, a years-long project that would have carried oil sands crude from Alberta, Canada, to the American Gulf Coast.

President Biden signed an executive order to have the country reenter the Paris Climate Agreement, less than four months after formally withdrawing.

President Biden's wave of executive actions includes an order to reexamine one controversial, but widely used, pesticide called chlorpyrifos. The Trump administration kept it on the market.

President Biden has set his sights on more than 100 Trump administration environmental rollbacks as well as plans to rejoin the international climate accord.

Overwhelmed sewers. Flooded streets. Deadly heat waves. Baltimore is one of many American cities where the costs of climate change far exceed local resources. Should oil companies pay?

Pipeliners Local 798, which represents thousands of workers on projects across the country, has a history of racism and faces new allegations it discriminated against Black members.

Among the nearly 1,100 species the Migratory Bird law protects are Georgia’s own state bird, the brown thrasher, and many others, like the wood stork, barred owl and indigo bunting, that visit the state.

Dinosaurs ruled Earth for 180 million years, but to dominate they had to outcompete a slew of other animals. Paleontologist Emma Schachner thinks their lungs could have been the competitive advantage

Journalist Beth Gardiner and activist Yvette Arellano explain the long-term health effects of air pollution. Yvette lives in a Houston neighborhood near the largest petrochemical complex in the U.S.

At least a dozen people died and more than 80 people fell ill after untreated water from the Flint River caused lead to leach from old pipes, poisoning the water system city residents relied on.

As Americans stayed home during the pandemic, cars and planes produced less heat-trapping emissions. But the effect is only temporary.