Poland will only sign off on accelerated EU approval of the Paris climate deal on its own terms, its environment minister said in a letter to EU counterparts, casting doubt on a push by the bloc for adoption ahead of U.N. climate talks in November.

 Brazil could increase carbon emissions by up to 21 percent until 2030 and still meet its pledge under the 2015 Paris climate agreement to fight global warming,

 China and the United States, the world's top producers of greenhouse gas emissions, pledged on Friday to formally adopt by the end of the year a Paris deal to slow global warming,