their concern is that manz actions have set off a chain reaction that will be hard to stop. >> we have act. if we delay any more, we will find it much harder to mitigate the changes that are already occurring. >> this month, the world's environment ministers came to greenland for talks in the run- change summit. the scientific consensus says industrialized countries must cut greenhouse gas emissions 40% by 2020 to avoid the worst of the global warming. politically, that looks impossible. the search for compromise is on. >> we have to put pressure on governments and expectations of worldwide so they have to act. we have to make the price so high that they do not dare not deliver. >> the message that is coming from all of the science being done here in the arctic could not be clearer, the warming effect is dramatic and is speeding up. the politicians know it, but they're still arguing about how to respond. the disconnect between science and politics is growing. >> you are watching "bbc world news" and still to come, tough times for detroit as the motor city faces meltdown. the british go