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"Earth's ultimate recoverable resources of oil, estimated at 3 trillion barrels, contains 1.7 x 1022 joules of energy, which the Sun supplies to Earth in 1.5 days."
"The amount of energy humans use annually, about 4.6 x 1020 joules, is delivered to the Earth by the Sun in one hour." "The enormous http://samosval.herobo.com power that the Sun continuously delivers to Earth 1.2 x 105 terawatts dwarfs every other energy source, renewable or nonrenewable. It dramatically exceeds the rate at which human civilization produces and uses energy, currently about 13 TW. " The article nicely describes the potential for photovoltaics to satisfy our energy needs without greenhouse gas emissions.
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