Abstract

The reality of global warming from the buildup of fossil fuel carbon dioxide in the atmosphere is no longer in doubt. In retrospect, it was inevitable that the explosive growth of human carbon dioxide emissions, driven by population growth, industrialization and, most of all, by fossil fuel energy use, made it inevitable that human-induced warming would overwhelm climate change from all the other factors at some point. And we are at that point. I believe we can solve the climate/energy problem, but it will not be easy. This problem will not solve itself through the invisible hand of the market. Relevant costs and values are not being captured. Particularly serious is that we are investing in the wrong infrastructures for a sustainable energy world. Exponential growth cannot be sustained indefinitely on a finite planet. We could, and I believe should, try to maintain 2 to 3 percent per year world GDP growth to the end of the century as carbon dioxide emissions are held constant, decreased, and eventually phased out by mid-century. This paper discusses some ideas that could work if we get serious. Colleagues and I propose as a goal that by mid-century renewable energy sources should supply roughly a third of the world's power; clean, safe and sustainable nukes another third; and coal gasification with CCS the final third. At the same time, we need to implement everything we have in our alternate energy arsenal immediately.