CanWest News Service: Canada is standing in the way of accepting tougher targets for developed countries at the annual United Nations climate change summit because it believes the approach would be a mistake, Environment Minister John Baird said Tuesday. Delegates at the annual summit have drafted a declaration which recognized the "unequivocal science" that developed countries must lower their greenhouse gas emissions by 25 to 40 per cent below 1990 levels by 2020 to prevent "the worst …