I'm all for things like solar panels on the roof or a small wind generator. I doubt it would be practical for all a homes enerygy needs, but sure could make a dent.
Where I worry is when people jump on the band wagon without thinking long term. For example, ethanol. It is a great idea but there are already rumblings of corn shortages (
link). This will raise the cost of corn, increasing the cost of feed, which means more land will be shifted to corn production and away from other crops. I know there is reasearch into other sources of ethanol (like other oil seeds) but those aren't as efficient.
It is these unexpected consequences that morry me. I think we need to do something, but we don't want to throw all our eggs in one basket.