Professor Kozoh Satoh (petroleum engineering) in Tokyo University successfully converted co2 into methane as the main component of the natural gas, in a condition equivalent to a state in which co2 is buried deep in the earth (Japan Geoscience Union Meeting 2009, May 21, 2009). The new technology presents the possibility of putting a recycling system to recover and recycle emitted CO2 into practice.
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Source: http://mainichi.jp/select/science/news/20090522k0000e040077000c.html