Joe Biden became the first sitting U.S. president to visit the Amazon rainforest on Sunday (November 17), flagging the dangers of global warming often dismissed by President-elect Donald Trump, who has vowed to scrap measures to fight climate change. While in the Amazon, Biden toured aboard his Marine One presidential helicopter, viewing the confluence of the Amazon and Rio Negro rivers at Manaus, spots where water levels have dropped sharply due to the worst drought in decades. Biden also went to the Museum of the Amazon in Manaus where he met with Indigenous leaders who want to protect the rainforest. Biden flew from Lima, Peru, to Manaus, Brazil, the largest city in the Amazon, to meet with local leaders working to preserve the rainforest.