Anthropogenic heat is a much smaller contributor to global warming than greenhouse gases are. In 2005, anthropogenic waste heat flux globally accounted for only 1% of the energy flux created by anthropogenic greenhouse gases. The heat flux is not evenly distributed, with some regions higher than others, and significantly higher in certain urban areas. For example, global forcing from waste heat in 2005 was 0.028 W/m, but was +0.39 and +0.68 W/m for the continental United States and western Europe, respectively.