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The Winter X Games in Aspen produces a big carbon footprint, the Aspen Times reports, but Aspen Skiing Company (Skico), which produces the games that ended Sunday, is taking measures to make the annual event more sustainable. Snowmaking is the biggest greenhouse gas emitter. Schendler estimates this accounts for 5 percent of Skico's overall annual GHG emissions. But by replacing older snowmaking guns with more efficient models, Skico is shrinking the event's carbon footprint, the paper reports.

Aspen, Colo., is one of the three cities in the nation to source 100% of its electricity from renewables, according to city officials. The city uses wind, solar and geothermal sources. "It was a very forward-thinking goal and truly remarkable achievement," said city Utilities and Environmental Initiatives Director David Hornbacher. The other two cities to have met their 100% renewable energy targets are Burlington, Vt., and Greensburg, Kan.