The numbers are telling us something:
• 7 billion people on earth, with 2.7 billion scraping by on less than $2 per day.
• 394 parts per million of carbon dioxide in the atmosphere, threatening to destabilize the global climate.
• $15 trillion of public debt in the United States, an unfathomable sum of money to be paid back by the next generation.
• 2 percent of adults owning more than half of all household wealth in the world.
• 400 ocean zones devoid of life, with the dead zone in the Gulf of Mexico estimated to cover almost as much area as the U.S. state of New Jersey.
Hidden in these numbers are stories of real people and real places in real trouble. And perhaps the most important number of all is one—one single blue-green planet ...