https://www.tandfonline.com/doi/pdf/10.1080/01973533.2017.1296360?casa_token=kx7wFa_YH1sAAAAA:iEjkkX6T6GLcPU02FLCiIjcTiIUK3SNS80narcrRV8pLfre4A2bGR4-Ggz1NXGB5uk4DmPrAc8G2 2017 Environment Low