MARRAKESH, Morocco (Thomson Reuters Foundation) – Governments have plenty of unfinished business to hammer out a rulebook for the new Paris Agreement on climate change by 2018, experts said as U.N. negotiations wound up early on Saturday.

Many environment and development groups welcomed the united front presented by some 195 nations as they faced a campaign threat to quit the accord by U.S. President-elect Donald Trump, which cast a shadow over the two-week gathering in Morocco.

“We call for the highest political commitment to combat climate change, as a matter of urgent priority,” governments said in the Marrakesh Action Proclamation issued on Thursday.