In the Paris Agreement, nearly 200 countries set their own national targets for reducing or controlling pollution of heat-trapping gases. It was negotiated in 2015 with lots of prodding by the US and China and went into effect on November 4, 2016.
The outcome of the US presidential election hangs in the balance as the last few states continue to count ballots, including some of the most competitive battleground states where the tally could take days to complete.
Bernie Sanders, who has energised liberals and young voters, sought to pull away from the rest of the field, while Joe Biden hoped to ride a wave of momentum and endorsements to cement himself as the standard-bearer for the party’s moderate wing.
The 38-year-old Buttigieg's surprise decision was set to shake up the race this coming week when 14 states vote on "Super Tuesday."
A resounding victory in South Carolina has thrust Joe Biden back into the race for the Democratic presidential nomination, but that could all change in two days when voters go to the polls in 14 "Super Tuesday" states.
While Sanders and Buttigieg finished first and second in Tuesday's New Hampshire primary respectively, the contest also showed the growing appeal of US Senator Amy Klobuchar of Minnesota.
His campaign has all the momentum. But securing the nomination might prove harder than winning the presidency.
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