Scrap tires have been on environmentalists' blacklist for decades. They pile up in landfills, have fed enormous toxic fires, harbor pests and get burned for fuel.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/reducing-tire-waste-using-completely-degradable-synthetic-rubber
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/science-daily
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/solid-waste
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/landfill
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/scientists
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/non-biodegradable-waste-1
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environmentalists
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rubber
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution