So many of those 'could maybe happen' are, in fact, happening right now. The researcher is also quoted as saying 'more likely than not' which is pretty big when it comes to something like the AMOC shutting down. This really is catastrophic and really should be causing governments to take immediate, massive, steps to avert it including steps to sanction countries that are causing it.
The big consequence here is for the EU. And the only way to deal with this is for the EU to force US, India and China to seriously reduce energy use, and with that, their economy.
This is not going to happen. The EU can't even convince itself to stop buying from China.