Nearly 200 nations faced a Monday deadline to file what the United Nations' climate chief calls “among the most important policy documents governments will produce this century” — their plans on how they will cut emissions of heat-trapping gases.

Nearly all nations missed a UN deadline Monday to submit new targets for slashing carbon emissions, including major economies under pressure to show leadership following the US retreat on climate change.

Many of the world's biggest polluter nations have missed a U.N. deadline to set new climate targets as efforts to curb global warming come under pressure following U.S. President Donald Trump's election.