At the UN climate summit in Copenhagen, 192 governments are aiming for a new global agreement to constrain greenhouse gas emissions and curb human-induced climate change.
But some commentators are unconvinced that rising greenhouse gas emissions are the cause of modern-day warming. Either they say the world is not actually getting warmer or that a new treaty would hurt economic growth and well-being.
So what are their arguments, and how are they countered by scientists who assert that greenhouse gases, produced by human activity, are the cause of modern-day climate change?
http://news.bbc.co.uk/2/hi/science/nature/8376286.stm