For we would all look up, say yes, those costs are higher than the benefits and move to non-CO2 emitting methods of power generation and transport.

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Analysts say that in order to meet the 2030 target - which Mr Cameron said he "basically endorsed" last year - only about 10% of UK electricity can come from gas-fired power stations emitting at current levels.

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But high-power light-emitting diodes (LEDs) promise a brighter future in outdoor illumination.

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Power plants produce more electricity while emitting fewer pollutants.

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Assuming that humans will find something better to power the world with than carbon dioxide-emitting fossil fuels in the next one or two hundred years, that total warming back then was greater or equal to what we are likely to inflict on Greenland.

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Poland relies on highly CO2-emitting coal for most of its electricity and argues that higher carbon prices would mean higher power prices, or even a shift to natural gas that would increase its dependence on Russia.

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But we will be making sure that the next generation of them, the next set of power plants to be built for example, will be low or non-carbon emitting.

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As a result devices that use them need fewer LEDs (light-emitting diodes) to provide backlighting, allowing the screen to take up less room and use less power.

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