Carbon dioxide concentrations have reached a crucial level.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/carbon-dioxide-levels-hit-record-high-wmo
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/daily-news-analysis-mumbai
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/carbon-dioxide
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/world-meteorological-orgnisation-wmo
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/global-warming
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/green-house-gases
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/el-nino
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/atmosphere