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I'll gather the latest scientific evidence on human responsibility for climate change. Yes - according to the overwhelming scientific evidence and consensus, humans are the principal cause of recent climate change. What major scientific bodies conclude NASA states: "There is unequivocal evidence that Earth is warming at an unprecedented rate. Human activity is the principal cause." The Inte

Is it too late? I'll pull the latest science on what can still be reversed and what can't. No — according to NASA, NOAA, the IPCC and other scientific bodies, it is not too late to limit, slow, and over time partially reverse global warming — but some changes already set in motion are irreversible on human timescales, and a full return to pre-industrial climate is not possible overnight. What s

Vaccines remain one of the best-studied ways to prevent disease — I'll pull the latest evidence on how well they work. Yes, vaccines are one of the most effective tools ever developed to prevent disease. Evidence from the World Health Organization (WHO), the U.S. Centers for Disease Control and Prevention (CDC) and other scientific bodies shows they are highly effective at preventing illness, se

Ultra-processed foods and public health — I'll pull the latest evidence on their risks. Yes - the current scientific consensus is increasingly treating ultra-processed foods (UPFs) as a significant and growing public health hazard, although debate remains about how to define and regulate them. 1. What are ultra-processed foods? The most widely used definition is the NOVA classification system: