http://thinkprogress.org/climate/2015/06/16/3670127/state-environmentalism-emisisons/
"A state legislature’s strong environmental voting record can translate into real results for states, according to a new study.
The study, published this week in Proceedings of the National Academy of Sciences, looked at greenhouse gas emissions data for all 50 states going back to 1990. Researchers then compared that emissions data to a range of other factors, including the environmental record of state legislators — determined by the League of Conservation Voters scorecard system — employment rate, and population. The researchers, both from Michigan State University, found that there was a correlation between the voting records of legislators and a state’s greenhouse gas emissions."
