It appears the US Senate lacks the political will to mitigate rising CO2 levels.
23:29 GMT, Thursday, 21 May 2009 00:29 UK
By Roger Harrabin
US Energy Secretary Steven Chu says the US will not be able to cut greenhouse emissions as much as it should due to domestic political opposition.
Prof Chu told BBC News he feared the world might be heading towards a tipping point on climate change.
The House of Representatives is debating a climate and energy bill but even if it passes it may be rejected by senators, many of whom are funded by the energy industry.
To the anger of environmentalists, he said that one compromise would be approving new coal-fired power plants without obliging them to capture and store their carbon. The UK government has made this a stipulation for new coal plants but Prof Chu declined to explain why the US government would not follow suit.
http://news.bbc.co.uk/2/hi/science/nature/8061929.stm