A toxic environment is known to create health problems for people, but sick people can also create health problems for the environment.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/when-human-illness-rises-environment-suffers-too
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/science-daily
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/kenya
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/lake
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-pollution
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/africa
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/fisheries-0