Global GDP increased by twenty to forty times in the twentieth century. Life expectancy has doubled. That depended hugely on fossil fuels. If moving away from

Global GDP increased by twenty to forty times in the twentieth century. Life expectancy has doubled. That depended hugely on fossil fuels. If moving away from fossil fuels was free we'd do it. The problem is the huge cost. Hopefully it will happen over the next 100 years. Most people would happily spend 100 / year to get off fossil fuels. But 10K? 5K? That's the question. Now we can spend money on research which has a huge payoff.