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. He said that over the first two years of President Obama's administration, "We didn't get as much done as the President had hoped for" in respect to the issue of climate change.
Professor Holdren faces a more sceptical Congress than he would like, and one that proposes a series of congressional hearings to assess the science of climate change.
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