What is the urgency of a 40% cut in CO2 emissions by 2020?
Scientists have said we need cut in CO2 emissions of at least 80% by 2050, but this must be a constant downwards trajectory. For instance – if the entire 80% cut came in 2049, so much CO2 would have been emitted in to the atmosphere that it is likely the planet would have passed the point of no return.