Coal and oil use must begin declining after 2020, and natural gas, nuclear and renewable energy usage must rapidly increase, for the world to begin curbing emissions in the next decade, the International Energy Agency said in a report Monday. The IEA, a Paris-based energy monitor for industrialized countries, laid out a number policies that would lead to a peak in energy-related emissions by 2020, recommending profound changes in energy consumption ahead of a key U.N. climate change summit this year . According to the IEA, in order to cap emissions coal demand needs to gradually decline over the next 15 years, falling 13% between 2013 and 2030. Oil demand should also peak after 2020, gradually declining over the course of the next decade though it will still maintain the biggest share of the overall energy mix. Meanwhile, demand for nuclear energy should more than double from its 2013 […]