The Utica and Marcellus shale natural gas plays based respectively in Ohio and Pennsylvania have provided 85-90% of U.S. shale gas production growth since start of 2012. Their ongoing drilling efficiency is a key driver. In fact, increases in shale drilling efficiency have contributed to the breakdown of traditional methods that use rig counts to estimate oil and natural gas production. Frequently mentioned is how renewables continue to evolve, but so does the oil and gas industry. The shale business in particular continues to advance: rig mobility, multi-pad drilling, and other rapid evolutions mean more gas using less rigs and resources.