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Ways to help reduce light pollution and keep night skies dark and clear.

Until a few years ago, Nuno da Silva's arcane occupation -- professional pollution calculator -- was of little utility to the corporate world. But in these days of global-warming worries and greener-than-thou marketing, companies suddenly can't get enough of his services. Revenue at the division he manages exploded 150% in 2008 and continues to expand this year, despite the recession. Since the beginning of 2008, he has added 13 people to his staff, bringing the number of employees to 16.

How to cut down on light pollution from your home and keep night skies dark.

Since the fuel costs are increasing a lot so there comes the different forms of energy to avoid pollution and increase the green house gas effect.