George W Bush and all other political leaders has promised to br "Seriously consider " cutting 50 of greenhouse gas emission br by 2050.- G8 summit more... br br Needless to say, this agreement is just the very beginning. br Agreement on an effective and workable regime is going to br prove very hard indeed. There are many technical difficulties br to overcome. Political obstacles to effective policies will br prove huge, as well br br Many around world has launched "The campaign" of decade... br "Global warming" .....