The U.S. has previously pledged to curb emissions 17 percent from 2005 levels by 2020.
The E.U. unveiled a new commitment to slash greenhouse-gas emissions 40 percent from 1990 levels by 2030, a proposal that sets the bloc apart from most attendees at the summit by outlining an emissions target that extends beyond 2020.
European Commission President Jose Manuel Barroso said E.U. member nations will achieve that goal by relying on clean energy for 27 percent of their power and improving energy efficiency by 30 percent.
Barroso said the bloc has a long-term ambition of cutting emissions by 80 to 95 percent by 2050. Additionally, the commission president announced that the E.U. aims to spend 20 percent of its budget for 2014 to 2020 on efforts to address global warming.
The E.U. intends to hand out 3 billion euros, or roughly $3.9 billion dollars, to help developing nations cut emissions over the next seven years.
British Prime Minister David Cameron said that the U.K. is on track to cut emissions by 80 percent by 2050. Cameron did not, however, announce any new targets not already agreed to by the country.
Cameron also said that the U.K. would set aside nearly 4 billion pounds, or $6.5 billion, to boost international climate change action.
Chinese Vice Premier Zhang Gaoli repeated China's previously stated goal of cutting carbon emissions by 40 to 45 percent from 2005 levels by 2020. Gaoli did not announce any new emissions targets. The vice premier also announced that China will set aside $6 million for U.N. efforts to boost South-South coperation to address global warming.
French President Francois Hollande announced that France will set aside 750 million euros, or approximately $1 billion, for the Green Climate Fund, a pot of money intended to help developing countries rein in air pollution.
Canada's environment minister, Leona Aglukkaq, announced a series of government regulations aimed at curbing greenhouse emissions from cars and trucks, including stricter fuel-efficiency requirements for cars and heavy-duty vehicles.
Japanese Prime Minister Shinzo Abe shied away from making formal commitments during the summit, saying that Japan will announce targets for next year's Paris climate talks "as soon as possible."
Abe also said that Japan is considering making a donation to help developing nations take action to address global warming.
Doris Leuthard, the president of Switzerland, said the country is considering a pledge of $100 million to the Green Climate Fund.
Swedish Prime Minister Fredrik Reinfeldt said that the country will cut emissions 40 percent from 1990 levels by 2020. The country aims to produce zero net emissions by 2050.
The Prime Minister of Denmark, Helle Thorning-Schmidt made a fresh commitment for Denmark to donate $70 million to the Green Climate Fund. Throning-Schmidt also said that Denmark's goal is to rid itself of fossil fuels by 2050.