The world is warming. Global warming refers to the rising average temperature of air and Ocean on the earth's surface since the 20th century, which is expected to continue. Evidence shows that for every 0.6 degree rise in temperature, 150000 people die every year as a result of the negative effects of global warming. Among them: glaciers, permafrost and sea ice are disappearing, sea water level is rising, seasonal imbalance and weather become more extreme. When the temperature rises further, it will cause more floods, droughts, pestilence, famine and other situations, and damage the entire ecosystem.