WWF: Urgent shift to renewables needed to cut CO_2 levels

摘要

As carbon dioxide (CO_2) levels are set to reach 400 parts per million (ppm) for the first time in human history, green group World Wide Fund for Nature (WWF) is calling for an urgent shift to sustainable and clean energy sources. According to WWF, scientists from the Mauna Loa Observatory in Hawaii are set to announce that levels of atmospheric CO_2 are reaching 400ppm now, marking a critical point on the pathway to dangerous levels of global warming.