"Since 1751 roughly 315 billion tons of carbon have been released to the atmosphere
from the consumption of fossil fuels and cement production.
Half of these emissions have occurred since the mid 1970s." cdiac.esd.ornl.gov
The Climate Accountability Institute has updated its Carbon Majors Project which details the direct and product-related emissions traced to the major industrial carbon producers in the oil, natural gas, coal, and cement industries through 2013.