Neither rain nor sleet nor a massive snowstorm on the Eastern Seaboard can stop the letters from pouring into Grist. In the latest mailbag, a U.S. Energy Department advisor defends President Bush's hydrogen car initiative, while other readers share their thoughts on EPS (that's the stuff commonly mistaken for Styrofoam), the real problems along the Mexico-U.S. border, and much more. Find out what your fellow readers have to say, only on the Grist Magazine website.