Third-parties are generally full of eccentrics (remember that the UK is still FPTP, even if they're a multi-party system). Eccentrics typically aren't the "very serious" types looking at tradeoffs.
The large portion of the environmentalist left are degrowthers who literally want people to just live with less, which means "less energy" is actually good. It will never be a politically viable position, but again, we're talking about a party that until recently has never come close to wielding power.
The large portion of the environmentalist left are degrowthers who literally want people to just live with less, which means "less energy" is actually good. It will never be a politically viable position, but again, we're talking about a party that until recently has never come close to wielding power.