What are the greatest health risks in the last 50 years?

or:What are the greatest health risks in the last 50 years?or:From the invention of the automobile to the invention of airbags, the death toll on US

or:What are the greatest health risks in the last 50 years?

or:From the invention of the automobile to the invention of airbags, the death toll on US highways was steady at 50,000 lives per year. That apparently did not depend on the number of cars, miles driven, or population (which tripled during that period).You don't say what you would consider to be a risk. You are talking about statistics, and statistics are more specific than that.

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