When the European Union
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/us-airlines-challenge-european-emissions-rule
[2] http://admin.indiaenvironmentportal.org.in/category/author/james-kanter
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/new-york-times-new-york
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/european-union-eu
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/united-states-america-us
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-transport
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/carbon-dioxide
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/emissions-trading
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/kyoto-protocol