Scotsman: CARBON dioxide emissions will need to become “negative” in the second half of this century, with more of the greenhouse gas absorbed than is put into the atmosphere, a report warned yesterday. Drastic reductions in greenhouse gases of 85 per cent by 2050, and more in the following years are needed to avoid temperature rises which would lead to dangerous climate change, the State of the World annual report from the Worldwatch Institute said. The study warned that temperature …