greenhouse effect

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1. Ummu says:

   July 17, 2012 at 7:39 am

   First, its all a guess but the sun will continue to shine for about ahntoer 2-4 billion years. So for all practical purposes, its eternal.Solar energy depends on sunshine, one disadvantage is cloudy, overcast, rainy, snow etc. days. No sunshine, no real energy. Another difficulty is converting solar energy, solar panels generate direct current (DC) and this has to be converted to AC current to run appliances, etc. in your house. In order to store solar energy, batteries are required, so the DC current from the solar panels can charge the batteries, and then the DC current must be converted to AC.Solar panels are not cheap but the price is coming down. They also don’t last forever and can be damaged by hail, etc.The good news is, solar energy is clean, not pollution except for the manufacture of the panels and for the moment, sunshine is still free.

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