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A new robot is designed to sink sargassum before the stinky seaweed comes ashore. Sargassum can wreck local economies, ecosystems — and even threaten human health, some research suggests.

President Biden has pledged urgent action on the "existential threat" of climate change. But his struggles to get his plan through Congress may undercut U.S. influence at a global climate summit.

Democrats will soon take control of the U.S. House and are vowing to put climate change on the agenda. Some are calling for a "green new deal," while others support a growing push for a tax on carbon.

Hurricane Ida rapidly gained strength right before it hit Louisiana on Sunday. Abnormally hot water in the Gulf of Mexico acted as fuel for the storm.

The head of the Environmental Protection Agency says he does not agree that carbon dioxide is the main driver of climate change.

During the campaign, the president-elect said climate change is not real, and he rejected last year's international agreement to cut greenhouse gases.

Since his reelection, President Obama has talked a lot about the importance of addressing climate change and promised action. Environmentalists have criticized him for not doing more to confront the issue. In the coming weeks he'll announce a new agenda promoting energy efficiency and reducing greenhouse gas emissions.

The Kyoto Protocol of 1997 didn't slow down the gradual warming of the planet. Now governments meeting for a two-week summit are trying an a la carte approach.

The U.S. has long enjoyed a solid reputation as a trustworthy place to do business. But President-elect Trump's potential conflicts of interest around the globe could challenge that reputation.

Six advocates were first elected in 2022. This year, all who ran were endorsed by the group No Coal, No Gas, which advocates for transitioning the region’s grid off of fossil fuels.