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EPA says methane emissions from natural gas production have dropped 36% from 2007-2011

Green Car Congress

The figure includes the direct effects and those indirect effects due to the production of tropospheric ozone and stratospheric water vapor.) The methane and non-combustion CO 2 emissions from natural gas systems are generally process related, with normal operations, routine maintenance, and system upsets being the primary contributors.

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Study finds fleet switch from PFI to GDI engines will result in net reduction in global warming

Green Car Congress

emission control technologies, and vehicle age and maintenance history. … The increased fuel economy of GDI engines means lower CO 2 emissions per mile; however, higher BC [black carbon] emissions (the most-potent absorptive agent of anthropogenic PM) could potentially offset any climate benefits of reduced CO 2 emissions.…

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