No partisan difference? See the latest congressional LCV scorecard and the canyon-sized gap between the two parties on environmental issues.
http://scorecard.lcv.org/members-of-congress
for example, page 2: from CA:
name, party/state/district, 2014 score, lifetime score
Denham, Jeff RCA-10 3%8%
Miller, George DCA-11 83%88%
Pelosi, Nancy DCA-12 91%92%
Lee, Barbara J. DCA-13 91%96%
Speier, Jackie DCA-14 94%87%
Swalwell, Eric DCA-15 97%95%
Costa, Jim DCA-16 34%48%
Honda, Mike DCA-17 94%97%
Eshoo, Anna G. DCA-18 97%97% (my lady!)
Lofgren, Zoe DCA-19 97%92%
Farr, Sam DCA-20 91%94%
Valadao, David G. RCA-21 3%2%
Nunes, Devin G. RCA-22 6%4%
McCarthy, Kevin RCA-23 3%3%
Capps, Lois DCA-24 94%96%
McKeon, Buck P. RCA-25 3%7%
Brownley, Julia DCA-26 94%94%
Chu, Judy M. DCA-27 91%97%
Schiff, Adam B. DCA-28 97%97%
Cárdenas, Tony DCA-29 91%92%
Sherman, Brad J. DCA-30 97%97%
Miller, Gary G. RCA-31 6%3%
Napolitano, Grace DCA-32 83%90%
Waxman, Henry A. DCA-33 97%92%
Becerra, Xavier DCA-34 94%92%
Negrete McLeod, Gloria DCA-35 77%75%
Ruiz, Raul DCA-36 89%87%
Bass, Karen DCA-37 94%88%
Sanchez, Linda DCA-38 91%91%