One in four mammals now faces extinction, while 90 percent of the large fish are already gone. Our aquifers are starting to dry up, our soil growing too salty for crop production. We’re running out of oil, running low on uranium. Even phosphorus—one of the principal ingredients in fertilizer—is in short supply. In the time it takes to read this sentence, one child will die of hunger. By the time you’ve made it through this paragraph, another will be dead from thirst (or from drinking dirty water to quench that thirst).
