Humanity’s demands exceeded the biosphere’s regenerative capacity by 1999.

Evidence

Finally, the National Academy of Sciences published in 2002 an article that purported to assess the relationship between human demands and the biosphere’s regenerative capacity, concluding that “humanity’s load corresponded to 70% of the capacity of the global biosphere in 1961, and grew to 120% in 1999.” — Richard J. Lazarus, The Making of Environmental Law, 84