Amazon founder Jeff Bezos may be donating $10 billion to aid the global climate fight, but the second richest man in the world acknowledged that it will take much more to slow down global warming.

When asked by ABC News' Maggie Rulli whether $10 billion will "make a dent in climate change," Bezos replied, "It’ll take trillions of dollars to make a dent in climate change."

"And it’s gonna take nation states, it’s gonna take companies, and it’ll take NGOs and nonprofits as well," Bezos said. "What philanthropic dollars can do is move very quickly. There’s things we can do."

In February 2020, Bezos announced his $10 billion pledge to climate change but updated that commitment in March to say he would spend the $10 billion by 2030.

-ABC News’ Stephanie Ebbs, Bruno Roeber and Maggie Rulli

The U.S. submitted a revised strategy to the United Nations that lays out how the nation will meet its climate goals

Officials have submitted two documents to the UN that are part of updating its commitments to the Paris Agreement. This is the first time the U.S. has updated these submissions to the UN since 2016.

The country’s path to net zero by 2050 requires "transformative actions" this decade, according to the report. The transition will rely on five key areas: Decarbonizing electricity and installing more wind and solar energy; switching to cleaner fuels and electrifying wherever possible, like in transportation and buildings; cutting energy waste and moving to energy sources that can fill the same energy demand more efficiently; reducing methane and other types of emissions that cause even more warming than carbon dioxide; and scaling up carbon dioxide removal technology.

"Near-term actions to accelerate this transition are being implemented rapidly, rooted in actions from across the federal government and other governmental and non-governmental actors in the United States," the long-term strategy states.

-ABC News’ Stephanie Ebbs

President Joe Biden apologized to fellow world leaders at COP26 for the decision made by his predecessor to pull out of the Paris Agreement.

Following his planned remarks at the summit, he made unscripted remarks at a smaller session hosted by U.K. Prime Minister Boris Johnson, where he offered a candid apology for the lack of leadership from the U.S. in the climate fight.

"I guess I shouldn’t apologize, but I do apologize for the fact the United States, the last administration, pulled out of the Paris Accord and put us sort of behind on the eight ball," Biden said.

Biden was forthcoming with world leaders that he will need to convince Congress to approve additional funding to help nations around the world fight climate change.

In June 2017, then-President Donald Trump announced plans to withdraw from the agreement claiming that could be economically detrimental and cost 2.5 million Americans their jobs by 2025.

The withdrawal became official on Nov. 4, one day after Election Day.

Re-entering the Paris Accord was among the first actions Biden took upon swearing in as president on Inauguration Day on Jan. 20.

-ABC News’ Molly Nagle and Sarah Kolinovsky

Mike Bloomberg, a member of the UN Special Envoy, and Gina McCarthy, the White House's national climate adviser, were some of the guests that joined the Biden administration on stage for the launch of the U.S. Center, a public diplomacy initiative, at COP26.

Highlighting the goal to cut emissions by 50% in nine years by 2030, Bloomberg said the world can't set goals for 2050, a year "which, I at age 79, am not likely to see."

Bloomberg announced Bloomberg Philanthropies' intention to close a quarter of all the world's existing coal plants and cancel all proposed new coal plants by 2025. He also committed $10 million to the “America is All In” coalition to mobilize climate action.

"Of course, now that we have a strong partner in the White House, we can raise the bar higher, we can do more and we can do it faster," Bloomberg said. "What we can't do is sit back and wait for Congress to act."