by Rhiannon Branch (Brownfield Ag News) General Motors, the largest US auto maker, has set a target to become carbon neutral by 2040, including the phase-out of gas and diesel-powered vehicles by 2035. On Thursday, the company announced a science-based approach toward carbon neutrality that focuses on the transition to battery electric or other zero emission vehicle technology. … Geoff Cooper, President and CEO of the Renewable Fuels Association, tells Brownfield GM has set lofty goals before and not achieved them – like pledging to make half of their auto output flex-fuel vehicles. “I would encourage people to take these announcements with a grain of salt, maybe a grain of lithium salt. There is a lot of posturing going on right now with the new administration and these aspirational announcements are getting blown a little bit out of proportion.”