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| alternative energy | |||
| animal dung as fuel Excrement from animals that may be dried and burned to generate energy or converted to liquid or gaseous fuels, such as methane, through chemical processes | |||
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| alternative energies | |||
| alternative sources of energy | |||
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| animal dung as fuel | |||
| energia alternativa: 8 phrases in 4 subjects |
| Environment | 4 |
| International Monetary Fund | 1 |
| Natural sciences | 1 |
| Transport | 2 |