Renewable energy technologies are facing big challenges because of the credit freeze and plunge in oil and natural gas prices.
21
7:40
October '08
21
2:09
October '08
Renewable energy technologies are facing big challenges because of the credit freeze and plunge in oil and natural gas prices.
13
21:25
August '08
Like other energy alternatives, heat pumps have won new admirers as energy costs have skyrocketed, and the small businesses that install them have seen sales surge.
07
4:56
June '08
Eco-conscious developers are taking advantage of the greenness of geothermal heat pumps to cool buildings.