A mod to control the spread of pollution. By default, the pollution absorbing effect of trees is nerfed and pollution spreads further: this is intended for use with mods like RSO that significantly reduce the frequency of biter bases. However the mod can also be configured to reduce spread and/or buff trees.
Importantly, the amount of pollution actually produced is unchanged, so biter evolution is not affected.
Settings are changed within config.lua

Based upon Eco Trees by Laige: https://mods.factorio.com/mods/laige/eco-trees