| 1 | The algae would absorb carbon dioxide and produce methane which could be used to produce energy. | |
| 2 | Leading the way is China, which is heavily promoting the use of biogas technologies. | |
| 3 | Keeping pigs or other animals is the easiest way to produce methane, but not the only one. | |
| 4 | Now, industrial plants lease the land above the garbage. Warehouses, boat manufacturers and methane bottlers are some of the operations underway. | |
| 5 | Manure that decomposes naturally releases 20 times more greenhouse gases than biogas does when burned as fuel. |
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