Great message!
You're truly gifted with drawing landscapes! The animation was at times a little repetitive and jerky, but overall the style and use of colours totally makes up for it. Sound went along very well with the themes.
For those of you who "didn't get it", here's a little something that might put the idea into perspective:
The current population of the world is around 6,500,000,000 people. Let's say for this idea that every person in the world leaves one can on the ground per week. That's 52 cans per year sitting on the ground from one person. If everyone on the planet were doing that, it would be... *calculator* 338,000,000,000 cans. Imagine walking through some park with 338 billion cans scattered around the place. lol =\
I'm missing a lot of details with that idea, but you should get the point. Chances are people who don't clean up after themselves drop more than one can a week wherever they want, and a whole lot of other shit too while their at it (newspapers,wrappers,food). And of course not everyone in the world has access to a Coke machine, but cut the population numbers in half even, and do the math - that's a lot of garbage on the ground...
I guess it's a good thing that some people care and have moral sense. But hey, if you want to end up living in trash...