About.com‘s Urban Legends page debunks the burning snow videos that have been making the rounds of the usual sites of late:
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Several videos have cropped up on YouTube documenting a “weird phenomenon” variously described as “burning snow,” “fake snow,” “chemical snow,” and “snow that won’t melt.” The videos show people holding cigarette lighters and blowtorches up to a handful of snow and remarking on how the latter seemingly blackens and “burns like plastic” instead of melting, all the while giving off a “chemical odor.”
As is the fashion these days, some folks are resorting to conspiracy theories in lieu of science to explain the phenomenon, the result being one big Internet freak-out over supposed government-backed weather manipulation (“geo-engineering”), chemtrail fallout, nanobot invasions, and HAARP attacks (I even found one article using the term “false flag”).
On the other hand, there’s plain old, ordinary physics.