How much methane leaks during the entire lifecycle of unconventional gas has emerged as akey question in the fracking debate.  Natural gas is mostly methane (CH4).  And methane is a far more potent greenhouse gas than (CO2), which is released when any hydrocarbon, like natural gas, is burned.

Even without a high-leakage rate for shale gas, we know that “Absent a Serious Price for Global Warming Pollution, Natural Gas Is A Bridge To Nowhere.”