Nuclear power plants arent being built fast enough for the world to hit important carbon emissions targets, according to the International Energy Agency. A lack of trust in nuclear technology, coupled with the global economic downturn that began in 2008, has resulted in a slowdown of construction and a plateau of the worlds nuclear energy capacity. In order to achieve that aim, 186 gigawatts of nuclear capacity must be added between now and 2025. At current rates of nuclear plant construction, the Earths nuclear energy output will fall between 5 and 24 percent short of that target.