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Climate change is here. From the millions displaced by the floods in Pakistan to Californian and Canadian towns incinerated by wildfires, we are experiencing the anguish that climate change causes. Fossil fuels are making the planet unlivable, and they are deadly. We know that we must cut emissions if we are going to limit the catastrophes, but is that enough? In Into the Clear Blue Sky, climate scientist and chair of the Global Carbon Project Rob Jackson explains that we need to redefine our goals. As he argues here, we shouldn't only be trying to stabilize the Earth's temperature at some arbitrary value. Instead, we can restore the atmosphere itself in a lifetime—and this should be our moral duty.