Correction to: Clean Technologies and Environmental Policy https://doi.org/10.1007/s10098-019-01754-5

In the original article by Díaz et al. (2019), the authors have become aware of an error in the application of Equation 4, aimed at checking the validity of the method.

As it appears in the article,

$$ {\text{Cr}} = \frac{\hbox{Ci}}{\hbox{Ri}} = \frac{0.076}{0.9} = 0.08\quad {\text{Ci}} = \frac{{\left( {4.022 - 4} \right)}}{{\left( {4 - 1} \right)}} = 0.0076 $$

When redoing the calculations, the result is:

$$ {\text{Cr}} = \frac{\hbox{Ci}}{\hbox{Ri}} = \frac{0.0073}{0.9} = 0.008\quad {\text{Ci}} = \frac{{\left( {4.022 - 4} \right)}}{{\left( {4 - 1} \right)}} = 0.0073 $$

According to this, for the method to be valid, the value of Cr must be less than 0.10. In fact, the value of Cr is 0.008, less than 0.10. Therefore, this change does not affect the results and conclusions obtained.