There is a widespread view that a liberal state may prevent people from harming others but that it should not promote certain comprehensive doctrines about the good life. In environmental policymaking this means
that the state may prevent us from harming others (by limiting or taxing our emissions)
but that the state may not prescribe by which means we should reduce emissions, whether this be eating less animal produce, travelling less, buying less stuff in general, etc. — that’s a matter of personal choice
and that the state may not prescribe to reduce our emissions out of a certain motivation; as long as we reduce our emissions, the state should not care whether we do so grudgingly, whether we do so out of love of nature, whether we do so by embracing a lifestyle of simplicity, whether we embed this change in a religious lifestyle, etc.
Here is one specific way to challenge the 2nd and 3rd aspect of this widespread view. It is just terribly cumbersome if the state refrains from enforcing certain means of reducing emissions and refrains from engendering certain motivations in the citizenry. It is inefficient to let individuals decide individually on their preferred ways of reducing emissions. Coordinating lifestyle change would save costs. Changing mindests and motivations is simply much easier and needs less willpower, when it’s done together. The state could save each of us lots of trouble by using tax money to celebrate green changes in mentality, by inculcating new green paradigms in schoolkids, by coercively enforcing the normality of reduced mobility rather than letting us commit to this goal in isolation, by publicly creating momentum for a change in diet, etc.
Given that in the long run we have to change our mindsets and lifestyles anyway in order to refrain from harming others and given that travelling this road together is just much less pain, one might argue that the sheer cost savings of the community doing this with state enforcement and state encouragement justifies the accompanying curtailment of liberty.
I am making this point very hesitantly. It’s more of a question: How far do the mere psychological cost savings — the size of which is often underestimated in my view — go in allowing illiberal environmental policy measures?