The latest round of UN-led climate talks has opened in Bonn with delegates from almost 200 countries in attendance.
Over the next two weeks, negotiators hope to clarify the rule book of the Paris climate agreement.
It is the first major meeting since US President Donald Trump announced plans to take the US out of the Paris pact last June.
Many delegates are unhappy with White House plans to promote fossil fuels as a solution to climate change.
An adviser to the US President is expected to take part in a pro-coal presentation in the second week of this conference, which is officially known as COP23.
