Simply put, if you aren't taking steps to reduce your footprint, you are part of the problem.
You may not buy into climate change theories, the politics surrounding them, or Al "ManBearPig" Gore, but you cannot, YOU CANNOT, deny that your mere existence leaves a wake of damage to the environment, reducing the earth's ability to support you. This isn't a hippie tree-hugger thing. This shit is happening and we're getting closer, every minute, to the point of no return. Whether it's overuse of natural resources, or the fuckery that our addiction to fossil fuels has created, we as individuals need to address our habits, reconnect with the world that supports us, and do our best to minimize our impact on it.
The No Impact Experiment is a bit over a month away. The premise is to take a week of your life and push towards one full day of zero impact. It's possible, and it's only a week. Will you live like that for the rest of your life? It's ideal, but unlikely. Instead, the important outcome is an awareness of your choices and actions and what effect they may have on the problem: are you reducing it or adding to it? Change yourself, change the world. You know that jar you drop your loose change in? You're always surprised when you cash it in and take home $50+ home, aren't you? It's the same thing, small changes to your everyday activities add up.
Go the the website, register, read the manual, and start paying attention to what you're doing. Stop being an "Earth Day-only activist" and commit to making a permanent change. Paper or plastic? You should make noise the next time someone asks you that, and then smack them with the re-usable bag you brought with you.