One day renewable energy looks like a sunrise industry, the next, tumbleweeds are blowing around a setting solar panel. What has changed? The price of emitting carbon dioxide. In 2005 the European Union created the world's first proper carbon market, the EU Emissions Trading Scheme (ETS), which compels highly polluting industries to buy permits to emit CO2. The number of permits is limited, so the idea is that supply and demand set a price that encourages the development of a low-carbon economy. (source: newscientist.com)
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