Because the kilowatt-hours used by cars ultimately come from some carbon-based source (power plant or otherwise), the calculation converts kilowatt-hours to equivalent gallons of gasoline consumed.
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Nevertheless, many environmentalists fiercely resist any moves to ease arbitrary, prohibitive barriers to the construction of the best non-carbon-dioxide-producing energy source of all: nuclear power plants.
The switch to Sunoco Green E15, the official fuel of NASCAR and a renewable, low-carbon power source, reduced greenhouse gas emissions by 20% compared with unleaded gas.
Some applaud it as a lower-carbon source of electricity.
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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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But corn kernels are a cheap and eco-friendly source of sugar--which is also a source of carbon.
It is a source of low-carbon energy and can contribute to the UK's energy mix and security of supply longer-term.
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Impressed by arguments that nuclear energy is a proven source of low-carbon power, and worried about the dependence on foreign fossil fuels caused by the decline of North Sea oil and gas, the government has been preparing the ground for a nuclear revival.
All that's needed, apparently, is an energy source, some sort of carbon-based material and a bit of water.
It is a source of base load, low-carbon and largely fixed-cost power for many utilities.
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It focuses on the biggest human source of greenhouse gases - emissions of carbon dioxide, or CO2, from power plants.
Many venture capitalists and investment bankers see a carbon-trading regime and massive subsidies for renewable energy as a potential source of windfall profits.
All life as we know it on Earth trades off a source of complex carbon molecules, such as amino acids - just as it needs water and energy.
At the annual meeting of the Carbon Disclosure Project--a non-profit investor organization devoted to greater transparency in greenhouse gas emission statistics--Sun released a set of open-source software tools that companies can use to track carbon emissions.
But should he proceed with regulations to control pollution from existing coal-fired power plants, the single largest source of carbon pollution, those regulations probably will contribute to shuttering facilities already struggling to compete with cheap natural gas.
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.
However, beyond the smokestack, looking at the full life-cycle accounting for carbon of various biomass feedstocks, other reports have found that the source of the feedstock matters.
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