The solar radiation energy absorbed in some form by the Earth's atmosphere, oceans, continents and living organisms in or on them has an average value of 250 watts per square meter. 250 watts correspond to the power of four humble standard lightbulbs.
Despite its rather modest magnitude this energy, combined with the equally modest greenhouse effect of the terrestrial atmosphere, keeps the average temperature of our planet at 15 degrees centigrade, making life - as we know it - possible on Earth.
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