| 1 | All of these features come at a cost: large energy requirements. | |
| 2 | The new type of electrode, coated in gold nanoparticles can boost the amount of electricity to useful quantities. | |
| 3 | This was approximately 19% of the world' s electricity (up from 16% in 2003), and accounted for over 63% of electricity from renewable sources. | |
| 4 | China is the world's biggest emitter of greenhouse gases, largely because it relies on coal for 70 per cent of its power. | |
| 5 | The two homes with roofs of highly reflective paint used 35 percent less electricity last summer than the two with less reflective paint. |
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