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"In a remarkable union of science and art, landscape painter Diane Burko shows how the planet's glaciers have changed form over the last century in her latest exhibit "Politics of Snow." To tell the story, Burko tracked down glaciologists from the US Geological Survey's National Snow and Ice Data Center at the University of Colorado, Boulder, and others. She then painted a series of photos for each mountain based on historic and present day photographs. Her collection demonstrates the changing face of glacial mountains across the world, including the Matterhorn in the Alps and Grinnell Glacier in Montana's Glacier National Park." The Scientist

Videos and related media

via Dave Carlson: "Keep this startling sequence of satellite images (LandSat, from USGS) in mind when you teach or speak about glaciers"

Climate scientists have long argued that ancient air trapped in Antarctic ice is the smoking gun that links carbon dioxide to global warming. Over the past 800,000 years or so the planet has gone through a series of ice ages interspersed with relatively warm periods (during which glaciers retreat back toward the poles) - and inevitably, these warm interludes happen when there's more CO2 in the atmosphere

This is a great site for background information. It's more of a researcher and information site than an educational outreach site (although it has that, too). It's very accessible and a good resource to either review a topic or start learning about something. Targeted to older audiences, or some portions are suitable for upper middle school. NSIDC supports research into our world's frozen realms: the snow, ice, glacier, frozen ground, and climate interactions that make up Earth's cryosphere. Scientific data, whether taken in the field or relayed from satellites orbiting Earth, form the foundation for the scientific research that informs the world about our planet and our climate systems.