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The Ward et al. (2016) Plos-One paper is an important, heavily-cited paper inthe decoupling literature. The authors present evidence of 1990-2015 growth inmaterial and energy consumption and GDP at a world level, and for selectedcountries. They find only relative decoupling has occurred, leading to theircentral claim that future absolute decoupling is implausible. However, theauthors have made two key errors in their collected data: GDP data is incurrent prices which includes inflation, and their global material use data isthe total mass of fossil energy materials. Strictly, GDP data should be inconstant prices to allow for its comparison over time, and material inputs toan economy should be the sum of mineral raw materials. Amending for theseerrors, we find much smaller levels of energy-GDP relative decoupling, and nomaterials-GDP decoupling at all at a global level. We check these new resultsby adding data for 1900-1990 to provide a longer time series, and findconsistently low (and even no) levels of global relative decoupling of materialuse. The central claim for materials over the implausibility of future absolutedecoupling therefore not only remains valid but is reinforced by the correcteddatasets.

Metrics matter, a Formal comment on Ward et al Plos-One 2016 paper : Is decoupling GDP growth from environmental impact possible?