President Joe Biden, with granddaughter Natalie Biden, boards Air Force One, Sunday, Nov. 17, 2024, in Lima, Peru. Biden is traveling to Manaus, Brazil. (AP Photo/Manuel Balce Ceneta)

MANAUS, Brazil — Joe Biden on Sunday became the first sitting American president to set foot in the Amazon rainforest, as the incoming Trump administration seems poised to scale back the U.S. commitment to combating climate change.

The massive Amazon, which is about the size of Australia, stores huge amounts of the world’s carbon dioxide, a greenhouse gas that drives climate change when it’s released into the atmosphere. But development is rapidly depleting the world’s largest tropical rainforest.

Joined by Carlos Nobre, a Nobel-Prize winning scientist and expert on how climate change is impacting the Amazon, and Biden climate adviser John Podesta, Biden lifted in his helicopter over a stretch of the rainforest, for a good view of the shallowing of waterways, fire damage and a wildlife refuge. He was also getting a peek at where the Rio Negro and Amazon rivers meet.

Biden will then meet local and indigenous leaders and visit an Amazonian museum as he looks to highlight his commitment to the preservation of the region.

His administration announced plans last year for a $500 million contribution to the Amazon Fund, the most significant international cooperation effort to preserve the rainforest, primarily financed by Norway.

So far, the U.S. government said it has provided $50 million, and the White House announced Sunday an additional $50 million contribution to the fund.

“It’s significant for a sitting president to visit the Amazon. … This shows a personal commitment from the president,” said Suely Araujo, former head of the Brazilian environmental protection agency and public policy coordinator with the nonprofit Climate Observatory. “That said, we can’t expect concrete results from this visit.”

She doubts that a “single penny” will go to the Amazon Fund once Donald Trump is back in the White House.

The incoming Trump administration is highly unlikely to prioritize the Amazon or anything related to climate change. The Republican president-elect already said he would again pull out of the Paris agreement, a global pact forged to avert the threat of catastrophic climate change, after Biden recommitted to the agreement.

Trump has cast climate change as a “hoax” and said he will eliminate energy efficiency regulations by the Biden administration.

Still, the Biden White House on Sunday announced a series of new efforts aimed at bolstering the Amazon and stemming the impact of climate change.

Among the actions is the launch of a finance coalition that looks to spur at least $10 billion in public and private investment for land restoration and eco-friendly economic projects by 2030, and a $37.5 million loan to the organization Mombak Gestora de Recursos Ltda. to support the large-scale planting of native tree species on degraded grasslands in Brazil.

Biden is also set to sign a U.S. proclamation designating Nov. 17 as International Conservation Day, and will highlight in remarks during the visit that the U.S. is on track to reach $11 billion in spending on international climate financing in 2024, a six-fold increase from when he started his term.

The Amazon is home to Indigenous communities and 10% of Earth’s biodiversity. It also regulates moisture across South America. About two-thirds of the Amazon lies within Brazil, and scientists say its devastation poses a catastrophic threat to the planet.