From 1961 to 2009, farmland increased by only 12%, while farm production increased by about 300%. Johan Norberg, Progress (2016): http://j.mp/2JBxW5A pic.twitter.com/klMhVqt5nt
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While this is definitely a gain in productivity, it is still important to recognize the effects of this productivity on the biosphere in other metrics other than sheer land used.. few I can think of would be 1. Loss of rainforests. 2. Depletion of ozone. 3. Loss of species, etc