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Its more than just cars. And how can they not work if only a small % of drivers use them?
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One volcanic eruption puts more toxins in the air then every single car ever made combined.
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https://www.skepticalscience.com/volcanoes-and-global-warming.htm
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Edited by Britton: 6/7/2015 7:30:01 PM[quote]Human activities, responsible for a projected 35 billion metric tons (gigatons) of CO2emissions in 2010 (Friedlingstein et al., 2010), release an amount of CO2 that dwarfs the annual CO2 emissions of all the world’s degassing subaerial and submarine volcanoes. The published estimates of the global CO2 emission rate for all degassing subaerial (on land) and submarine volcanoes lie in a range from 0.13 gigaton to 0.44 gigaton per year (Gerlach, 1991; Varekamp et al., 1992; Allard, 1992; Sano and Williams, 1996; Marty and Tolstikhin, 1998). The preferred global estimates of the authors of these studies range from about 0.15 to 0.26 gigaton per year. [b][u]The 35-gigaton projected anthropogenic CO2 emission for 2010 is about 80 to 270 times larger than the respective maximum and minimum annual global volcanic CO2 emission estimates. It is 135 times larger than the highest preferred global volcanic CO2 estimate of 0.26 gigaton per year[/u][/b](Marty and Tolstikhin, 1998).[/quote] http://volcanoes.usgs.gov/hazards/gas/climate.php