Southern Hemisphere carbon dioxide (CO2) levels have risen above the 400ppm limit, and this has made scientists worried.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/record-high-carbon-dioxide-levels-north-west-tasmania-worry-scientists-global-warming-and-ocean
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/international-business-times
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/carbon-dioxide
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/green-house-gases
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/australia
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/el-nino
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/corals