To keep annual carbon emissions from increasing in a world of growing energy needs will require very large-scale alternatives to current fossil-fuel systems. "Wedges" represent the effects of alternatives that have the potential to displace roughly two terawatts (trillion watts) of greenhouse-gas emitting power sources, thus cutting gigatons (billions of tons) of carbon dioxide emissions over the next half-century.
Global-Studies_resources - PBS - 0 views
BBC NEWS | | Urbanisation - 0 views
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Interactive map of urbanization and population growth
Canadian, Please ♫ - YouTube - 0 views
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Funny video about Canadian culture
World Maps - geography online games - 0 views
Geography Awareness Week - National Geographic Education - 0 views
The Future of Paper Maps? - 0 views
Ten ideas to change the world - CNN.com - 0 views
Debates: Culture | idebate.org - 0 views
Energy 'wedges' - MIT News Office - 0 views
St Matthew Island reindeer cartoon - Stuart McMillen comics - 0 views
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Cartoon showing difficulties of over-population
