Fig. 1: Percent of nutrient treatment possible for green treatment technologies in each waterbasin for the Level 5 scenario of reducing mean nutrient concentrations to 2 mgN L−1 and 0.02 mgP L−1.
From: The potential of carbon markets to accelerate green infrastructure based water quality trading

a Nitrogen treatment. b Phosphorus treatment. Red indicates no treatment, blue indicates full treatment. White space designates waterbasins which didn't have wastewater treatment facilities or didn't require nutrient treatment.