Paper or plastic? Plastic.
The question is asked millions of times every day: "Paper or plastic?" Do you want your groceries in a paper bag or a plastic bag? Well, if the impact on the environment was your concern, then the answer is simple: if you have to pick one of these, pick plastic. That's because, all in all, using plastic bags impacts the environment much less than using paper ones. How do we know that? We have calculated the Composite Environment Impact Index of both, tracing every step of production, use, and disposal of the bags, and found out that paper uses more resources, and pollutes more, than plastic. Here are the calculations, click on the item name to trace the environmental impact calculations: CEII to be sure.