Going carbon negative

摘要

In its newly released Fifth Assessment Report1, the Intergovernmental Panel on Climate Change (IPCC) emphasised the need to develop solutions that can help remove CO2 from the atmosphere in the future. Similar warnings have already come from the United National Framework Convention on Climate Change (UNFCCC) and climate scientists. For the first time in history this year, atmospheric CO2 levels reached 400 parts per million (ppm). If those levels are to stabilise, global greenhouse gas (GHG) emissions will have to fall to near zero or even become negative in the second half of the century.