Climate change is a global issue – from the point of view of the Earth's climate a molecule of CO2 emitted in Bejing is the same as a molecule emitted in Sydney.
If you are interested enough in the climate crisis to read this post, you probably know that 2 degrees Centigrade of warming (or 3.6 degrees Fahrenheit) is the widely acknowledged threshold for "dangerous" climate change.
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What's certain is that a totalitarian enclave like Cuba's can't continue to exist so change will definitely come there eventually.