It may, or may not, be a coincidence that the only decreases achieved in GHG emissions to date have been involuntary, and happened due to economic collapse.
LONDON (AFP) – Greenhouse gas emissions have fallen thanks to the global downturn, handing the world a chance to move away from high-carbon growth, a report said Monday, citing an International Energy Agency study.
The unpublished IEA study found carbon emissions from burning fossil fuels had dropped significantly this year -- further than in any year in the past four decades.
Falling industrial output is largely responsible for the plunge in emissions, but other factors also played a role, including shelving plans for new coal-fired power stations because of falling demand and lack of financing.
http://news.yahoo.com/s/afp/20090921/bs_afp/financeeconomyenvironmentclimatewarmingiea