United States Officially Reenters Paris Climate Accord

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Climate activists protest on the first day of the Exxon Mobil trial outside the New York State Supreme Court building, 2019.
Climate activists protest on the first day of the Exxon Mobil trial outside the New York State Supreme Court building, 2019. Credit: ANGELA WEISS / AFP

The United States officially rejoined the Paris climate agreement on Friday, reinvigorating the global fight against climate change as the Biden administration plans drastic emissions cuts over the next three decades.

Scientists and foreign diplomats have welcomed the U.S. return to the treaty, which became official 30 days after President Joe Biden ordered the move on his first day in office.

Since nearly 200 countries signed the 2015 pact to prevent catastrophic climate change, the United States has been the only country to exit. Then-President Donald Trump took the step, claiming climate action would cost too much.

U.S. climate envoy John Kerry took part in virtual events on Friday to mark the U.S. re-entry, including appearances with the ambassadors of the U.K. and Italy and UN Secretary-General Antonio Guterres, saying the United States will try to make up for lost time due to Trump's withdrawal.

"We feel an obligation to work overtime to try to make up the difference. We have a lot to do," Kerry said at the event with the U.K. and Italian ambassadors.

Biden has promised to chart a path toward net-zero U.S. emissions by 2050. Scientists have said that goal is in line with what is needed, while also stressing that global emissions need to drop by half by 2030 to prevent the most devastating impacts of global warming.

Kerry along with Biden’s domestic climate adviser, Gina McCarthy, are spearheading the administration's climate agenda, coordinating regulations and domestic and international incentives aimed at speeding the deployment of clean energy and transitioning from fossil fuels.

Biden has also signed more than a dozen executive orders related to climate change, and has mobilized every federal agency to help shape the government's response.

Those measures will form the backbone of Washington’s next emissions reduction goal for the year 2030, or Nationally Determined Contribution (NDC), to be announced before a global climate leaders summit Biden will host on April 22. The next UN climate conference is in November in Glasgow.

Kerry did not say what the U.S. target would be but said it would be a "very aggressive, strong NDC" that would "earn our way back" into legitimacy in the Paris process.

The former secretary of state also said that the United States intends to "bring China to the table" in climate change diplomacy, even if there are disagreements over human rights and trade with the world's largest greenhouse gas emitter.

U.K. Ambassador to the United States Karen Pierce said climate is an issue where "China can be a helpful partner" but that "China, along with Russia, do sometimes behave as if everything is a competition."

She said this should encourage closer U.S., EU and U.K. coordination: "The closer we all are together on climate, the more we show the rest of the world that they can join us and help reduce global warming."

Despite the excitement over the U.S. return to global negotiations, climate negotiators say the path forward will not be easy. Biden’s climate goals face political challenges in the United States, opposition from fossil fuel companies and some concern among foreign leaders about U.S. flip-flopping on climate policy.

U.N. Secretary-General Guterres welcomed the return of the United States as restoring the "missing link that weakened the whole," but warned the road ahead will not be easy.

"This is the race of our lifetimes," he said. "We must go much faster, and much farther." 

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