Several recent studies have highlighted the possibility that the oceans and terrestrial ecosystems have started loosing part of their ability to sequester a large proportion of the anthropogenic CO2 emissions. This is an important claim, because so far only about 40% of those emissions have stayed in the atmosphere, which has prevented additional climate change.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/airborne-fraction-anthropogenic-co2-emissions-increasing
[2] http://admin.indiaenvironmentportal.org.in/category/author/wolfgang-knorr
[3] http://admin.indiaenvironmentportal.org.in/category/journal/geophysical-research-letters
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/land-use
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/carbon-dioxide
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-change
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/carbon-sequestration