Germany's environment minister, Sigmar Gabriel, says the United States has blocked progress on two key issues to protect the global environment.
He was speaking after a two-day meeting of environment ministers in the German city of Potsdam.
The issues were carbon emissions trading and rewarding developing nations for protecting their natural assets, he said.
Mr Gabriel said the US opposition was "not a surprise".
The Potsdam conference brought together ministers from the Group of Eight leading industrialised nations - the United States, Canada, France, UK, Germany, Japan, Italy and Russia - and Brazil, India, China Mexico and South Africa from the developing world.
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