Climate change agreements rest on negative emissions technologies that may be unachievable.

• By Richard Martin on January 8, 2016

technologyreview – While many scientists and climate change activists hailed December’s Paris agreement as a historic step forward for international efforts to limit global warming, the landmark accord rests on a highly dubious assumption: to achieve the goal of limiting the rise in global average temperature to less than 2 °C (much less the more ambitious goal of 1.5 °C), we don’t just need to reduce emissions of carbon dioxide to essentially zero by the end of this century. We also must remove from the atmosphere huge amounts of carbon dioxide that have already been emitted (see “Paris Climate Agreement Rests on Shaky Technological Foundations”).

Doing so will involve “negative emissions technologies”—systems that capture carbon dioxide and store it, usually deep underground. Such technologies are theoretical at best, but they are considered critical for achieving the Paris goals. Of the 116 scenarios reviewed by the Intergovernmental Panel on Climate Change to achieve stabilization of carbon in the atmosphere at between 430 and 480 parts per million (the level considered necessary for a maximum 2 °C rise in temperature), 101 involve some form of negative emissions. Tiếp tục đọc “The Dubious Promise of Bioenergy Plus Carbon Capture” →