A concentrated problem is one that could have a concentrated solution. Sewage farms use microbes to generate the methane which goes back into the gas grid e.g.

A concentrated problem is one that could have a concentrated solution. Sewage farms use microbes to generate the methane which goes back into the gas grid e.g. https://www.stwater.co.uk/news/news-releases/severntrentinvestsinthreenewbiomethanegastogridplants/ https://www.stwater.co.uk/news/news-releases/severntrentinve...