Renewable energy is energy which can be replenished at the same rate it is used. Renewable energy sources contribute approximately 25% of human energy use world- wide. The prime source of renew- able energy is solar radiation, i.e. sunlight. The Earth-Atmosphere system supports approximately
5.4 x 1024 joules per
year in the solar
radiation cycle
(Sorensen, 2004). (cont.)
This feature takes us on a journey throught history of climate change and shows ways out of the desaster by prospering economy at the same time: renewable energy. (55')
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