A 200-year period covering the heyday of both the Roman Empire and China's Han dynasty saw a big rise in greenhouse gases, according to a study that challenges the U.N.
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[1] http://admin.indiaenvironmentportal.org.in/news/romans-han-dynasty-were-greenhouse-gas-emitters-study
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/planet-ark-australia
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/green-house-gases
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/china
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/methane
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/history
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/deforestation
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/charcoal
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/europe
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/fossil-fuels
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/sea-level-rise
[13] http://admin.indiaenvironmentportal.org.in/category/thesaurus/india
[14] http://admin.indiaenvironmentportal.org.in/category/thesaurus/united-states-america-us
[15] http://admin.indiaenvironmentportal.org.in/category/thesaurus/carbon-dioxide
[16] http://admin.indiaenvironmentportal.org.in/category/thesaurus/european-union-eu
[17] http://admin.indiaenvironmentportal.org.in/category/thesaurus/russia