The expansion of natural gas production in the US has changed the landscape of thermoplastics. The largest building block in the industry, ethylene, can be produced from derivatives of crude oil or natural gas. Over the past few years, the increased production of natural gas in the US, supported by technological improvements related to horizontal drilling and hydraulic fracturing, caused the price of natural gas to see average annual declines of 11% between 2005 and 2015. This price shift, along with elevated oil prices throughout the past decade, caused many thermoplastic producers to prefer natural gas over oil in their production of feedstocks.