The Paris Accord was the last time we had a big agreement about reducing emissions, creating new targets. Canada left it when its oil production became too lucrative to forego. "You can't make countries do what they want unless you are a very powerful country yourself"
What can the global response to climate change tell us about the health of modern democratic states?
• Ben Ansell is professor of comparative democratic institutions at Oxford and author of “Why Politics Fail”
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