The combustion of fossil fuels has enriched levels of CO2 in the world
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/effects-past-present-and-future-ocean-carbon-dioxide-concentrations-growth-and
[2] http://admin.indiaenvironmentportal.org.in/category/author/stephanie-c-talmage
[3] http://admin.indiaenvironmentportal.org.in/category/author/christopher-j-gobler
[4] http://admin.indiaenvironmentportal.org.in/category/journal/proceedings-national-academy-sciences
[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/oceans-and-seas
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/climate-impacts
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/marine-life
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/fossil-fuels