Cornell University Prof. Robert Howarth claims in a new study that,
“Compared to coal, the footprint of shale gas is at least 20 percent greater and perhaps more than twice as great on the 20-year horizon.”
A respectable but counting-the-number-of-angels-that-can-dance-on-the-head-of-a-pin takedown of Howarth’s study may be found at EnergyInDepth.org.
But if you just want JunkScience.com’s cut-to-the-chase takedown, here it is:
Manmade emissions of CO2 from burning coal are not known to have had a discernible impact on climate. So even assuming that Howarth’s worst case scenario concerning shale gas was true, two times a non-discernible impact is still a non-discernible impact.