Just suppose we had no global warming. Just suppose that if we had warming, or virtually any climate change, it was caused all or mostly by the sun. Not by humans.

Just suppose our air quality was fine. Getting better year after year.

Just suppose the earth was, in fact, cooling.

Just suppose we are simply not, not running out of natural gas and oil.

You do not have to suppose. Lots of serious scientists tell us the above is true. 

On air quality, it is the Environmental Protection Agency that assures us our air quality gets better all the time. It zeroes in on six major pollutants. They have all fallen steadily and dramatically in the last 29 years. For instance, carbon monoxide levels are 76 percent lower. Sulfur dioxide levels are 68 percent lower and barely exist any more in the air we breathe. Lead levels are 91 percent lower.

Just suppose these things are true. If they are true - if we are not fouling the air - then we should feel free to burn gasoline in our cars, should we not? 

We are told we need to drive cars that get 42 miles per gallon. Why?  Because we are running out of the oil that gives us the gasoline. That is what we are told. But if we are not running out of oil, why bother with the 42 mpg?  Especially if it means lightweight cars that let more people die in crashes.