This. Governments are signatory to a huge number of agreements, and are members of various NGOs. Things start out as being representative of some will of the people, but over time it becomes a millstone around the government's neck if it the arrangement becomes politically difficult at home. And of course, those arrangements often morph to be to the benefit of those in charge.

What happens is that you get arrangements like the EU demanding migration quotas that the populations of various individual countries despise, or an automobile market that gets progressively more expensive as environmental legislation puts ever more pressure on manufacturers. And of course, if you're saving the world, who needs cars anyway? We should all be living Hong Kong style to save the environment, so we need more urban density.