I read not too long ago, can’t remember where, damnit, re: zinc batteries in hybrids. The mining and processing entailed until it ends up in a car expends more energy than driving a Hummer for thirty years.
“Is a Hummer cleaner than a Prius?” Link: http://www.freerepublic.com/focus/f-chat/1828450/posts
“Have You Hugged a Hummer Today?” Link: http://www.freerepublic.com/focus/f-news/1668872/posts