Globally, solar resources are abundant. Solar resources in Australia, Mexico, the Middle East, and southern and northern Africa are especially promising.

Parts of Latin America, India, central Asia, and China also have great potential. Other areas, such as Europe, have solar resources that are only marginally suitable for Concentrating Solar Thermal (CST), particularly in Spain and Portugal.

With action to capture feasible mid-term resources (particularly solar PV), the author's assessment suggests each state can generate renewable electricity equal to at least 20 percent of its current electric power sales.

Levelized costs for each energy technology option are mostly in ranges that overlap. Costs will vary with individual projects, but it is important to note that technology advancements have closed the price gap between renewable energy and conventional power. Nuclear and solar PV are currently the most costly energy resources to develop, though recent forecasts suggest solar costs will continue to decline in coming years with the addition of new manufacturing capacity.

Together, the top GHG emitting countries account for 84 percent of oil consumption, 58 percent of production, and 48 percent of known oil reserves.