Democrat candidate for US presidency promises to end US addiction to oil
Gaps emerging between McCain and Obama's plans for tackling global warming and energy security
European Parliament seeking pact to head off threat of legal action from US carriers over plans to extend emission trading scheme to cover aviation
Lieberman-Warner blocked in Senate, but with Presidential candidates signalling support for bill green groups insist cap-and-trade legislation could be passed next year
Democratic candidates seek to woo voters in coal rich states with support for carbon capture and storage