Rodale.com is challenging people to refrain from using plastic use this month. Why? Well, as we've discussed before here on CL Green, plastics leach BPA into our food and some types of plastic can be toxic. The second reason is because plastic is made of petroleum or natural gas, which are two nonrenewable resources. Third, many types of plastics cannot be recycled and by not using them, you're potentially keeping another piece of plastic out of a landfill.