From Shikha Dalmia writing in The Week:
Lefties and enviros merged into the modern-day progressive movement only when the New Left was persuaded that environmental degradation and social injustice were manifestations of the same greed-ridden system. Global warming, in a sense, combines this twin critique of capitalism on the grandest possible scale, indicting the rich West for bringing the world close to catastrophe by hogging a disproportionate amount of the global commons, leaving less for the developing world.
This is why, despite the demonstrated impossibility of imposing a global emission-control regime after the failure of the Kyoto treaty, liberals continue to demand that the West unilaterally cut emissions, even though this will arguably make little difference to global temperatures. It is a matter of cosmic justice, as far as they are concerned.
Indeed, if there is any doubt that liberal alarmism no less than conservative skepticism is driven by ideological commitments — and not a realistic assessment of actual risk and achievable solutions — Yale University’s Dan Kahan research ought to put them to rest. He found that when geo-engineering — pumping sulfates into the atmosphere to deflect heat — is offered as the solution to climate catastrophe instead of emission restrictions, liberals become far more questioning of global warming science. Why? Because, presumably, it does nothing to curb Western greed. Conversely, geo-engineering makes conservatives far more accepting of the science, likely because it avoids Big Government.