The United States would remain a party to the United Nations Framework Convention on Climate Changebr and could still participate in future U. N.-sponsored climate discussions.br Meanwhile, a core part of the Paris deal involved the United States promising $3 billion in aid to poorer countries to help them expand clean energybr and adapt to droughts, sea-level rise, and other global warming calamities.br President Trump said on Thursday that the United States was officially withdrawing from the Paris climate agreement, following through on a campaign promisebr and defying fellow world leaders who had pleaded with him to remain a party to the pact.