It turns out that global plant growth is not keeping up with the amount of atmospheric CO2 being released in the air.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/global-plant-growth-not-keeping-co2-emissions-reduce-gases
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/science-world-report
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/forests
[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/climate-change