However, it needs to be emphasized that small, resource-rich or affluent countries can achieve much faster transitions than large, resource-poor, or low-income countries. Current ambitions would require a rebuilding of the majority of the power grids in the world within the next 10 years, another achievement that would be completely unprecedented, which is not to say that it would be technically impossible, but only that it would come at a significant social and economic cost and would divert resources from other pressing needs, especially those of the world’s poor. For example, a solar power proponent might state that the potential for solar radiation absorbed by land is 790 zettajoules (ZJ), which was about 2,000 times the figure for fossil fuel extraction in 2010.