At the moment every other political announcement seems to have the word “green” in it. It is sometimes hard to tell the difference between progressive policies and simple greenwash.
What I recommend is to read the “Real” Green New Deal, put together by a collection of highly respected individuals including, Colin Hines, Tony Juniper and Andrew Simms (plus many more). It highlights how we need to tackle climate change in conjunction with the economic crisis and peak oil. It is the first piece of social policy that I have read for a very long time to actually excite me.
It is from this document that I think you can begin to judge other political parties green commitments in the run-up to the next election.
It is downloadable from:
http://www.neweconomics.org/sites/neweconomics.org/files/A_Green_New_Deal_1.pdf