Global warming. Greenhouse gases. Loss of biodiversity. Big carbon footprints. Endangered animals and plants. Species extinction. Stories and images about the grave dangers facing our planet-and by extension the more than six and one-half billion humans and myriad animals and plants that inhabit it-are increasingly visible in the media. Likewise, tips for reducing pollution and for conserving, recycling, and renewing abound. There’s no doubt about it-going “green”is red hot.