We talk about fossil fuels as being dirty. Burning coal and oil release not just CO2 but other contaminants; much of the mercury we worry about in fish is from coal plants. Even so-called cleaner gas contributes to air pollution (NOx is a precursor to smog, an inevitable result of combustion). This makes us sick, literally. Especially people who live near where these fuels are burned (near power plants, near highways).
According to this report, renewable energy has already saved around 13000 lives in the US alone, between 2008 and 2015. That's four times the number of people killed on 9-11.
In 8 years, Renewable Energy Has Saved 12,700 American Lives, Report Finds - Global Citizen