The Global Commons (eg the air we breathe, the rain water, the oceans) are too important in sustaining all the global population to let their management be left to any one political party. Climate change and other challenges are best solved by cross-party working.
It could be a mistake to attach hope for sustainability solutions to one particular party. That lends itself to people taking the view that, because they don't support that particular party, they should give up on sustainability altogether in order to demonstrate loyalty to their chosen party.
Best to make sustainability non-partisan, and to work to weave it into the fibre of all political parties. Our joint future on the planet is too big a thing to be left to become a political football.
The Planetary CFO - working towards a sustainable World Balance Sheet.