A crescendo of efforts at the sub-national level to shrink the country's carbon footprint will not fully counterract US President Donald Trump's decision to scrap his predecessor's climate policies and promote the use of fossil fuels, it found.
"Given the stated policies of the present US administration, currently committed non-federal efforts are not sufficient to meet the US commitments under the Paris Agreement," concluded the 120-page analysis, entitled "America's Pledge."
Under the 196-nation treaty, agreed outside the French capital 2015, the United States made a voluntary commitment to cut the country's emissions 26-28 per cent below 2005 levels by 2025.
The Paris pact marked the first time that all countries -- including emerging giants such as China and India -- laid out specific targets for greening their economies.
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Despite the US shortfall, a surge of climate action will keep the US emissions curve on a downward path, said the report, jointly issued by the World Resources Institute and the Rocky Mountain Institute.
"If these non-federal actors were a country, their economy would be the third largest in the world."
Twenty US states, 110 cities, and over 1,400 businesses with US operations have adopted quantified emissions reduction targets, the report found.
Collectively, they represent USD 25 trillion in market capitalisation and nearly a billion tonnes of greenhouse gas emissions per year.
Total global emissions were about 42 billion tonnes in 2015, according to the Global Carbon Project.
"America's Pledge and coalitions like 'We Are Still In' are showing that, despite reversals in Washington, US climate action is strong and growing," said Bob Perciasepe, president of the Center for Climate and Energy Solutions in Arlington, Virginia.
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