It is seen, therefore, as a bridge fuel, one that takes us from coal and oil to some mix of carbon-free energy in the future.

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The need to develop carbon-free energy sources is greater than ever, and Germany is leading the charge, breaking all previous solar installation records in 2012.

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Not everyone is convinced that wind-power is the most reliant route to clean, renewable carbon-free energy, and it is concerning that Britain is relying on a power source that must be backed up by more constant technologies such as nuclear, coal, or gas, because the wind blows inconsistently, as is its nature.

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In the effort to mitigate carbon emissions and climate change, sources of carbon-free renewable energy are sought, particularly wind power.

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Democratic leaders blocked such a vote arguing such an approach could hurt the environment as well as delay a transition to carbon-free, renewable energy sources such as solar and wind energy.

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The government announced that the city would be zero-carbon, powered entirely by renewable energy, car-free, and produce net-zero waste.

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Shale gas is also likely to divert investment in Britain from pricier but carbon-free nuclear and renewable-energy sources.

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Nukes may not be quite as clean as wind, solar or geothermal, but they provide a carbon-free and domestic source of energy that produces lots of jobs.

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By 2014, this rural district will be providing 236% of its own energy needs from renewables and hopes to generate significant revenue by exporting excess carbon-free power to the open market.

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