The world's most powerful nations are due to meet in the German city of Bonn for the annual climate conference, which is meant to be about implementing the Paris climate agreement.
But with US President Donald Trump's scepticism about climate change and his push for fossil fuels over clean energy, there are concerns about the ongoing effort to tackle global warming.
Trump has also threatened to pull the US out of the agreement.
Al Jazeera's Nick Clark reports.
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