Elizabeth Rogers, co-writer of The Green Book, The Everyday Guide to Saving the Planet, One Simple Step at a Time
Last week, to celebrate my 42nd birthday, I did the "green mom, back-to-basics, connect-with-nature, be-at-peace-with-my-laugh-lines" trek to beautiful Joshua Tree, with three of my girlfriends and their kids.

The thing about Joshua Tree on the cusp of summer is that it is close to 100 degrees. But I was prepared for the heat -- and prepared to keep my birthday group prepared (and hydrated) -- with reusable water bottles for each one. No piles of sparkletts minis were going to fill our rooms -- there was just no way I was going to make needless waste on the day of my birth.

The first day was a scorcher -- climbing at 7:30 am, the mercury moved past 82. We were well armed: hats, sunscreen and of course our trusty water bottles. But then my son started complaining that his bottle was leaking -- which in fact it was -- leaving him atop a rock panting from thirst.

Here was the problem: we had two days left and we were down a water bottle. To most people, this would be an easily solved dilemma: go buy a few packaged water bottles from the canteen and call it a day. But for me, well aware that we Americans throw away 60 million plastic water bottles per day, I had a hard time doing this. A really hard time. But I had to get over it -- and for that weekend, I shamelessly contributed to this shocking number, knowing full well that you can't stop drinking water in the desert.

The next plastic challenge during my birthday weekend came when one of my girlfriends presented the kids with gleaming new, PLASTIC, battery-operated water guns...