In the book, Tom Murphy explores the most likely energy sources to sustain civilization into the future. It is a textbook, so he gets into the calculations for each energy source. By far the most promising is solar. There is plenty of solar power at our current energy use levels. So solar could allow for growth for a while longer. But we are not talking thousands of years, at most growth (at our current levels) with solar could only last a couple hundred years. And then our planet is covered in solar panels. Hopefully growth stops before that point!
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