Do any governments or institutions have a live(ish) updating model of "what would happen" if trends continue? People reference studies all the time but what's the currently accepted model/outcome in the scientific community?

I remember hearing that melting of the ice caps will stop current flows in the ocean and bring about an ice age. Is that actually a thing or just fake news?

One of the things is a weakening jet stream which has caused all the recent havoc on getting cold polar air come inland.

This is why climate change vs global warming. We’re in for a hell of winters in the US as the jet stream weakens.

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Is a real concern. Half of Europe is "kissed" by tropical seawater running from the Gulf of Mexico towards Russia. This hot water creates a warmer than expected climate in the coastal areas. Portugal, UK, Denmark, Norway... all is warmer that it should be. If this current stops flowing or is weakened things will suck real fast.