Chernobyl and Fukushima were mostly contained by people that were around, yet they still had a profound effect on the environment. Doesn't it make sense that un

Chernobyl and Fukushima were mostly contained by people that were around, yet they still had a profound effect on the environment. Doesn't it make sense that uncontrolled meltdowns at ~ 700 reactors world wide would release so much radiation that pretty much all higher forms of life would die off?