[youtube https://www.youtube.com/watch?v=uiRzukC6tpk]

Methane Emissions – The greenhouse gas footprint of natural gas.  Robert W. Howarth , 26.10.2016

Methane and the Greenhouse Gas Footprint of Shale Gas. Bob Howarth, March 25, 2016

Methane emissions and climatic warming risk from hydraulic fracturing and shale gas development: implications for policy. Robert W Howarth, 8.10.2015