Whereas only a few years ago mainstream media directors were smearing climate scientists and creating doubts about their research, nowadays after numerous extreme weather events they briefly make benign reference to "climate change" when reporting these events. Well, I guess that's progress. But they still do not report about current scientific research. One has to go to independent sources such as Climate Code Red.
The author surveys the latest research to answer the question posed by the title--"Is climate change already dangerous?" Here is only one example of what he reports to answer this vital question:
With current CO2 levels at 400 ppm, a useful comparison is the Pliocene (3–5 million years ago). The research body is large and growing in this area...:
Rohling, Grant et al. find that during the mid-Pliocene, when greenhouse gases were similar to today, sea levels were more than 20 metres higher than today “we estimate sea level for the Middle Pliocene epoch (3.0–3.5 Myr ago) – a period with near-modern CO2 levels – at 25±5 metres above present, which is validated by independent sea-level data”. Likewise Hansen, Sato et al. find that “during the middle-Pliocene… we find sea level fluctuations of 20-40 metres associated with global temperature variations between today’s temperature and +3°C”.