How environmental propaganda is easily hidden on the web

Let's say you love going to the beach, but it's been galling you lately to see those unsightly plastic shopping bags blowing around in the wind. A scuba diver friend tells you they get twined around coral reefs and eaten by endangered sea turtles mistaking them for jellyfish. Would it help if you asked for paper, not plastic, the next time you buy groceries? Who would you ask for advice?

a) The people who make plastic bags for a living
b) The people who get paid millions of dollars to lobby for plastic bag makers
c) The chairman of your annual local beach clean-up party
d) A marine biologist