Watch these eco films online for free (sort of)

With the rise in popularity of eco-related documentaries and docudramas, just about every subject related to environmentalism has been covered — from GMO food to the slaughtering of whales to global warming.

Luckily, there are a good number of these films that are available online that you can watch for free* — and I don't mean by downloading them illegally. Here's a list of the most popular, highly rated, and most interesting-looking environmental documentaries I could find.