A glacier disappears high in the Peruvian Andes. Floodwaters surge across the English countryside. Ten thousand Pacific Islanders begin to evacuate their homeland. A dust storm turns day into night across the Inner Mongolian plains. These events may seem unrelated, but they are not. Even as scientists and other experts debate the specifics, climate crisis is already affecting the lives of millions.

In this ground-breaking book, Mark Lynas reveals the first evidence--collected during an epic three-year journey across five continents--about how global warming is hitting people's lives all around the world. From American hurricane chasers to Mongolian herders, from Alaskan Eskimos to South Sea islanders, Lynas's encounters and discoveries give us a stark warning about the even worse dangers that lie ahead if nothing is done.

High Tide's message is urgent and its revelations are at once shocking and inspiring--shocking as so few of us yet realize the magnitude of what’s happening, and inspiring as there is still time to avert much greater catastrophe. No one who reads this book will be able to look their children in the eyes and say "I didn’t know."