OPINION/COMMENTARY

National Geographic Melting Down? This is not your father's National Geographic any more. Once a coffee table staple with gorgeous photos of people, places and things, it now more resembles a host of other slick lobbying mags, pushing today's popular issues. Last month's cover story was "fat." What has that to do with geography, other than some people are skinny, some are large, and they all don't live in the same place? And obesity turns out to be a pretty slippery subject, given that what is fat today was considered healthy a century ago. This month it's global warming, a subject that actually lends itself to quantitative fact-checking, of which National Geographic apparently did little....