"The oceans have always shaped human lives," writes marine biologist Helen Scales in her vibrant new book The Brilliant Abyss, but the surface and the very edges have so far mattered the most. "However, one way or another, the future ocean is the deep ocean."

An urgent, resounding call to protect 50 percent of the earth's land by 2050--thereby saving millions of its species--and a candid assessment of the health of our planet and our role in conserving it, from the award-winning author of The Experience of Place and veteran New Yorker staff writer.