The extraction and use of coal causes many premature deaths and much illness. The coal industry damages the environment, including by climate change as it is the largest source of carbon dioxide, 14.4 gigatonnes (Gt) in 2018, which is 40% of the total fossil fuel emissions and over 25% of total global greenhouse gas emissions. As part of the worldwide energy transition many countries have reduced or eliminated their use of coal power, and the UN Secretary General has asked governments to stop building new coal plants by 2020. Coal use peaked in 2013 but to meet the Paris Agreement target of keeping global warming to well below coal use needs to halve from 2020 to 2030.