Limits to Growth

Article concerning the book, Limits to Growth, published in 1972.

"The authors estimate that we currently allow 9.5 million tons of phosphorus to flow annually into our oceans, mostly because of fertilizer use, and that past 11 million tons we may well trigger “large-scale ocean anoxic events.” Ozone concentrations in the atmosphere — 290 Dobson units before the Industrial Revolution and 283 at present — can’t dip below 276 without catastrophe, the authors note."

"We’re removing almost four times as much nitrogen from the atmosphere for human use as is safe, and the result are things like wide-scale water pollution and the addition of heat-trapping gases like nitrous oxide into the atmosphere. The species extinction rate, the authors argue, is probably 10 times the tolerable level of 10 species per million species per year, though they add that they’re less certain of this than other numbers. “However, we can say with some confidence that Earth cannot sustain the current rate of loss without significant erosion of ecosystem resilience.”