Reduce pollution risks and the negative impact of pollution from all sources by 2030 , to levels that are not harmful to biodiversity and ecosystem functions and services , considering cumulative effects, including: (a) by reducing excess nutrients lost to the environment by at least half , including through more efficient nutrient cycling and use; (b) by reducing the overall risk from pesticides and highly hazardous chemicals by at least half , including through integrated pest management, based on science, taking into account food security and livelihoods; and (c) by preventing, reducing, and working towards eliminating plastic pollution.