"What worries me the most is beyond the hockey stick."
"In his new book, Our Fragile Moment: How Lessons from Earth’s Past Can Help Us Survive the Climate Crisis, renowned climate scientist Michael Mann describes the world climate change is creating based on what we know from specific times in Earth’s four-billion-year history when the planet was extremely hot or extremely cold."
https://www.scientificamerican.com/article/our-fragile-earth-how-close-are-we-to-climate-catastrophe/