"megatons" - 1 õppematerjal

Green Illusions - book powerpoint - alternative energy

than people use globally in one year.  We could produce the entire energy consumption of the world, with present day solar cell technology, placed on just 2,6% of the Sahara desert.  Why don’t we all use the solar energy then ?  It would cost about 123 trillion dollars to make such a big solar array that could be capable of powering the planet, plus yearly maintenance. Making the solar panels and their associated hardware would yield about 149 000 megatons of CO2.  Wind turbines Advantages:  Zero greenhouse gases  Free fuel  Flexibility  Good for remote areas  Takes up a small plot of land https:// apps.carleton.edu/reasonpackage/reason_4.0/www/images/6075 9.jpg Wind turbines Disadvantages:  Noise disturbances Threat to wildlife  Wind is unpredictable  Suited to particular regions