If GM had kept up with technology like the computer industry has, we would all be driving $25 cars that got 1000 MPG.
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Now, we put out a lot of carbon dioxide every year, over 26 billion tons. For each American, it's about 20 tons. For people in poor countries, it's less than one ton. It's an average of about five tons for everyone on the planet. And, somehow, we have to make changes that will bring that down to zero.