A Common Question is "Why Target Plastic Bags". Since single use plastic bags are such a wide spread problem, it is a tangible and visible place to start in making people environmentally conscious that may lead to other environmental friendly habits.
A Letter from Jamie Rhodes, Program Director or UPSTREAM.
Proponents of plastic bag bans often point to the prevalence of plastic bags debris in the oceans. The below is a link to The Great Ocean Garbage Patch.