These plastic bottles don't need to be here - they can become recycled plastic picnic tables and any number of products

By Alysa Kleinman

About 270 million Americans visit national parks each year. They explore mountains and woods, see wildlife firsthand and discover culture. But along the way, they also generate 100 million pounds of trash. That's could fill quite a few recycling receptacles and park trash cans.

What can be done to solve this problem where visitors come to a park to enjoy the natural splendor but generate more than