I think we're one - third of the national average in terms of greenhouse gas emissions per capita. (treehugger.com)
It really adds up quickly in terms of greenhouse gas emissions savings, in terms of energy savings. (treehugger.com)
But uncertainties remain regarding their commercial viability — namely, how much these fuels will cost and what impact they may have on the environment, particularly in terms of greenhouse gas emissions. (greencarcongress.com)