Is the course of alternative energy stocks influenced by the price of crude oil?

Hi all,

got interested in stock of companies dealing with alternative energy sources. Such would be: wind, water, solar, ethanol, fuel cells etc.

I think the USA is starting to understand that oil will not last forever and that by using it we actually harm our world. I believe that this leads to a rethinking process that will rather soon start pushing the idea of alternative energy sources. Will stocks of such companies suffer every time prices of crude oil falls? Or is the idea of owning such stocks might get more stable?

Thanks
Micron