Independent: In three weeks’ time in Bonn, the international community will begin the negotiations leading up to December’s United Nations climate change meeting in Copenhagen, which, it is hoped, will produce a new climate treaty to replace the Kyoto Protocol. If the world is to check the march of global warming before it is too late, it is increasingly clear that this meeting must lead to agreement on worldwide cuts in carbon dioxide (CO2), the principal greenhouse gas — emissions of which from …