Great post Stephen. I do agree that we are all very much a part of a capitalistic environment, where consumption is not just inevitable but glorified.   I feel that whilst politicians may encourage superficial behavioral changes, they do not want to push through the big ones, largely because of economic considerations and influence from political supporters.

In many ways, I feel that my choices are often hypocritical.  I don't buy animal products, yet 99% of my food is shipped long distances contributing to pollution/global warming etc..  Our dried dog food comes in heavy duty plastic bags.  Even if we responsibly recycle, the end result may be a very detrimental environment for someone else. (Plastic, poverty and pollution in China's recycling dead zone ).

Given our inability to individually make meaningful change, I think your point that  a  "degree of overt politicisation ... is required to effect meaningful change", is very valid.