What are the risks and uncertainties involved in bringing change to the energy system? Jeffrey Sachs dismisses some uncertainties that are not based in reality notably, the basic science of climate change and humanity's impact on atmospheric concentrations of carbon dioxide but digs into others in more depth. For example: Exactly how much will temperature rise for a give rise of carbon dioxide parts per million (PPM)? How fast will the ice sheets degrade, and when? In particular, he focuses in on "climate sensitivity and why we cannot predict climate change.

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