I let ChatGPT summarize the report and then asked it:

"if you could write ONE warning that makes clear to humans in one alinea what is going on and how & what we need to do to overcome climate change risks, what would it be?"

Its answer:

The warning to humans would be that climate change is an urgent global crisis that requires immediate and sustained action to avoid catastrophic impacts on human societies and the planet. This requires a transformational shift in how we produce and consume energy, reduce greenhouse gas emissions, protect natural ecosystems, and build resilience to the impacts of climate change. We need to act now to limit global warming to 1.5°C above pre-industrial levels, which will require unprecedented cooperation and effort from governments, businesses, and individuals around the world.