From the web…

That’s CalTech engineer David Rutledge, who spoke to EarthSky at a recent science meeting. He said governments around the world have overestimated coal reserves or, the amount of coal still available for energy use.

David Rutledge: That estimate, at least for these trends, appears to be high, for coal.

To figure out how high, Rutledge studied trends in countries that have already run out of coal.

via World coal reserves overestimated, says scientist » Radio Podcasts | Earth & Sky.