Ah, public lands! Vast tracts of open space take the family to for some nature, wildlife, fresh air…wait, what's that pungent, herb-like smell? As it turns out, public lands are a favorite of pot farmers - authorities estimate something like 900 groves exist in California alone - and all that unregulated cultivation is having an effect on the environment, and not just to make all of that crazy pine tree's jokes seem really funny. Instead, toxic agricultural runoff is polluting the waterways and harming animal populations. With groves being discovered in more and more states, could this be an argument for the legalization of marijuana?