The most optimistic of the four, in - depth scenarios projects renewable energy accounting for as much as 77 percent of the world «s energy demand by 2050, amounting to about 314 of 407 Exajoules per year. (climateandcapitalism.com)
Several different studies have been conducted and 400 exajoules from biomass is not a high estimate. (realclimate.org)
Some organizations have advocated for a bioenergy target of meeting 20 percent of the world's total energy demand by the year 2050, which would require around 225 exajoules of energy in biomass per year. (wri.org)