James Watt. His statement isn't really as bad as what I'd been led to believe. From that great source, wikipedia:

when asked whether he believed that natural resources should be preserved for future generations, he replied, "I do not know how many future generations we can count on before the Lord returns, whatever it is we have to manage with a skill to leave the resources needed for future generations."

More at:

http://en.wikipedia.org/wiki/James_G._Watt