How much climate change can still be considered safe?

A lot of people seem to misunderstand the 12 (now 11) year deadline. It's not that suddenly an apocalypse will occur in 2030. It's that after that point, we'll no longer have any realistic hope of avoiding the worst effects of climate change that will arrive in the following decades and centuries.

Maybe we need to explain it to people like cancer treatment: if we'd caught it early, maybe chemotherapy alone would have been sufficient. Today, we need invasive surgery, plus chemo, plus radiation therapy, and we also need to hope that untested immunotherapy treatments will work.

If we continue to leave it untreated, then our prognosis is very grim indeed. We won't die immediately, but our cancer will be inoperable.

It's assuming it's already safe. There is a good chance several armed conflicts of the last decades were influenced by climate chances consequences. Conflicts that also cascaded into other tension rising events, because of immigration, altered business, demography flux, etc.

People have already died because of climate change. So we’re already beyond “safe” climate change.

A good, free, and quick primer is just searching for “uninhabitable earth”. He talks about the real world implications and impacts for various levels of warming.

This doesn't state the fact that if we stop all emissions now, the temperature will keep rising because there is already too much CO2 in the atmosphere.