Growth rates peaked between 19 and have fallen steadily since then. It reached 1 billion just after 1800, 2 billion in the early 1920s, 4 billion around 1970, and is estimated at 7.6 billion as of December 2017.Ĭhevrolet Silverado Heavy Duty drive with John Deere, “Jessica Walker, courtesy of Chevrolet

The study's conclusion that those two factors together have produced carbon emissions as high as those of deforestation only worsens the total carbon emissions associated with human activities.Įarth's population has grown explosively for eight centuries it has been estimated at 370 million humans at the end of the Black Death in 1350. The impact of deforestation has been well-studied, but the collective impacts of grazing and of forest management have not. Together, the researchers estimate, those two factors together have produced carbon emissions equal to those of straightforward deforestation. It's also two additional factors: large-scale livestock grazing on grasslands, and forest 'management' that thins out forests by selective logging and removal of particular species. Chevrolet Silverado Heavy duty drive with John Deere, Jessica Walker, courtesy of Chevrolet

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