This isn't the set of a science fiction movie. This is a real cave in Mexico containing giant crystals of selenite. With temperatures over 110 degrees and humidity of 90 to 100% every visit carries a real risk of heat stroke and death. The people you see in the picture have vests filled with ice packs under their suits.In this course I will not have time to cover the conservation of such natural wonders. Some of the issues are similar to the conservation of biodiversity and some are rather different. I wish we had more time. I thought I'd mention it here though. This picture is from an article in this month's National Geographic. Check out the article and the picture's at their website. Amazing.
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