Book excerpt: Peter Fiekowsky--MIT-trained scientist, entrepreneur, and philanthropist--is the author of the forthcoming book CLIMATE RESTORATION: THE ONLY FUTURE THAT WILL SUSTAIN THE HUMAN RACE. This white paper, adapted from that book, offers an advance look at Fiekowsky's urgent message: that the net-zero carbon emission goal, embraced by many in the wake of the Paris Climate Accords, is not enough to ensure the survival of the human race. We must go further, restoring the climate by removing about one trillion tons of excess CO2 from Earth's atmosphere, thereby returning our planet to the same climatic conditions that have historically sustained humankind. Fiekowsky explains the technologies that can make this possible, responds to some of the challenges raised by skeptics, and offers an inspiring vision of a world in which our children and grandchildren can can have a real opportunity to thrive.