“Think about Sequoia,” Wanek said. “That’s 159 sites that we know of where there has been ground-clearing, and pesticides and herbicides applied. The impact goes well beyond the acreage planted. They create huge networks of trail systems and the chemicals that get into watersheds are potentially very far reaching — all the way to drinking water for the downstream communities.Unfortunately, the trend (growing pot on park land) has nothing to do with growers desire to destroy ecosystems and everything to do with marijuana being illegal. It's not like people are going to risk land-forfeit by growing on their land.
Bottom Line: Legalize it -- and the water will run pure.
* Oh, and I love the rhetoric of "Mexican drug cartels" -- I bet a month's salary that these ops are being run by gringos.