The US president's chief science adviser says the nation's current efforts to tackle climate change are insufficient in the long-term.
Speaking to BBC News at the American Association for the Advancement of Science (AAAS) meeting in Washington DC, Professor John Holdren said the current US Congress was unlikely to pass new legislation to put a price on CO2 emissions.
President Obama's administration's efforts, he said, would instead have to focus on developing cleaner technologies, expanding the use of nuclear power and improving energy efficiency.
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