The evolution of the Earth's first animals more than 500 million years ago caused global warming, according to a study.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/worlds-first-animals-caused-global-warming-study
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/global-warming
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/organic-waste
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/carbon-dioxide