Envoys from nearly 200 countries, including delegates from Washington, gathered for the conference in Bonn to negotiate a "rulebook", to be adopted next year, for enacting the global deal reached to cheers and champagne in 2015.
Delegates reported mixed progress in Germany, with the reemergence of divisions between rich and developing countries.
A key stumbling block was on finance for the world's poorer nations to help them prepare for, and deal with, the fallout from climate change -- including more frequent and severe superstorms, droughts and land- and crop-gobbling sea level rises.
The November 6-17 conference is the first of the UN's climate body since President Donald Trump announced in June that the US will withdraw from the agreement championed by his predecessor Barack Obama.
The rules determine it can only leave in November 2020, and in the meantime, Washington continues to fill its seat at the climate talks.
"The stars are not well aligned since Trump's exit" from the pact, Seyni Nafo, a negotiator for African nations, told AFP of the talks.
Not helping the mood, White House officials hosted a sideline event with energy company bosses Monday to defend the continued use of fossil fuels -- coal, oil and natural gas blamed for emitting planet-warming gases into the Earth's atmosphere.
At its very essence, the Paris Agreement seeks a drawdown of carbon emissions.
The pact commits countries to limiting average global warming to under two degrees Celsius (3.6 degrees Fahrenheit) over Industrial Revolution levels, and 1.5 C if possible, to avert worst-case-scenario climate change.
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