Billions could be spent developing state-of-the-art technologies that capture carbon dioxide out of the air, and they wouldn’t come close to the elegance and cost-effectiveness of the greatest carbon sequestration tool already at our disposal — the world’s 3 trillion trees. That might sound like a lot, but with a net loss of 12.8 million acres — the equivalent area of Costa Rica — occurring each year, we are swiftly outpacing the rate at which forests can regenerate.