This is a great graphic developed by
RICHARD PEREZ — ASRC — UALBANY
He has continued to refine it over the years. It puts the available energy resources into perspective. This is a 2 dimensional representation of a 3 dimensional illustration. Each circle should be visualized as a sphere, upon doing that this is to scale.
Dr. Perez is a long time expert at assessing how make renewable energy and conservation work in our economy as it is and visualizing how to do it in the future. You can see more of his work HERE.