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This book should be required reading for fossil fuel executives and policymakers. Lynas thoroughly explains what happens at each degree of planetary warming, summarizing 281 studies and sources. I picked up Six Degrees to better understand the impacts of climate change, and by the end of the book, I couldn’t recall what it was like to have only a vague understanding of heat, weather patterns, feedback loops, and their respective impacts to people, resources, and the planet. If you want the short version of this book, I recommend reading the final chapter, which summarizes each degree of warming quite succinctly. I’m rating this 4 stars instead of 5 for being a bit dense at times, and a tad disorganized in the presentation of geographic & thematic climate impacts.
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Highly Recommend! Very easy to read for a non-fiction book with information about climate and events in our lives that everybody should know about.
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Terrifying but essential reading.

I first read Six Degrees not long after it came out in 2007, and it's vision of the future seemed both terrifying and somewhat distant - too apocalyptic to feel real. Yet now the 1 degrees future is already here, with its impact already being felt. Talk of 1.5 degrees and 2 degrees targets often feel very removed from our everyday life, yet this book does a good job of demonstrating what they will actually mean for our lives. Hardly the most uplifting book, but one that will motivate you to do what you can to stop the worst potential impacts of climate change becoming a reality.
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A frightening but very important overview of what will happen to Earth when we don't stop the climate crisis we're already facing. 
The fact that climate change is already happening faster than scientists expected a few years ago, makes this book even more frightening than the first version of Six Degrees Lynas wrote. However, as Mark Lynas says: it is never too late to take action: "Just as 1.5°C is better than 2°C, so 2°C is better than 2.5°C, 3°C is better than 3.5°C and so on." 
Everyone should read this.