According to a study by the China Emissions Accounts and Datasets, the calculations by the Intergovernmental Panel on Climate Change (IPCC) of worldwide CO2 emissions overlook the fact that cement structure's absorb a good deal of CO2 emissions. Thus, the study contends, the IPCC has substantially overestimated the amount of CO2 emissions occurring around the world.
The study finds that "Cement, the ubiquitous material used to build roads, buildings and other infrastructure, absorbs about one billion tons of atmospheric carbon dioxide (CO2) annually." The study also estimates that, between 1930 and 2015, "cement reabsorbed 4.5 gigatons of carbon...worldwide...." http://www.cnsnews.com/news/article/barbara-hollingsworth/study-ipcc-doesnt-account-1-billion-tons-co2-absorbed-annually.
Thus, the study appears substantially to undercut the IPCC's continuous alarm bells about the impact of CO2 on the climate. Even though the study appears to have been lead by reputable scientists, given the IPCC's almost religious belief in climate change it is doubtful that the organization will seriously consider this study, let alone amend any already-reached conclusions.
You can find an abstract of the study at http://www.ceads.net/ and additional reference to the study in the journal Nature (http://www.nature.com/nature/journal/v524/n7565/full/nature14677.html) and Nature Geoscience (https://www.dropbox.com/s/vyo03iec31zb0re/ngeo2840-aop%20%281%29.pdf?dl=0).
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