Imho: because Western populations care about environmentalism and don't like to use their power to compel others, even if that would be more efficient.
Do you really believe western nations don't use their power to compel poorer countries to act in a given way?
I was talking about populations, not nations. The governments very much do, but often not with popular approval (see military engagements to secure economic interests). There's no popular support to pressure poor countries on climate change or pollution. If that existed, I'm sure that Western governments would have no second thoughts about applying pressure.
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Do you really believe western nations don't use their power to compel poorer countries to act in a given way?
I was talking about populations, not nations. The governments very much do, but often not with popular approval (see military engagements to secure economic interests). There's no popular support to pressure poor countries on climate change or pollution. If that existed, I'm sure that Western governments would have no second thoughts about applying pressure.