Natural Gas vs Solar & Wind

Article on natural gas versus solar and wind:

"In researching how best to make the transition to the green energy future, one of the first calculations I made was to find out how long the natural gas in each of the four categories would last if we obtained it independently — that is, only from U.S. territory. I was shocked by the result: Just using our 2006 rates of use of natural gas consumption — not including any major transition to fueling our cars and trucks — the “readily available” gas within the United States would be exhausted in just one year. That, plus what is called “technically recoverable” gas, would be gone in less than a decade. What is termed “unknown but probable” would last about a century"

On "unknown but probable" natural gas:
"Most of this gas is so deep underground or otherwise not very accessible that nobody is really sure that we can get at a lot of it, or of how high an environmental price we must pay to retrieve it."