The study doesn't actually say anything of the sort anyway, what it says is a typically vague: " It is still unknown, however, what percentage of Earth’s ecosy

The study doesn't actually say anything of the sort anyway, what it says is a typically vague: " It is still unknown, however, what percentage of Earth’s ecosystems actually have to be transformed to new states by the direct action of humans for rapid state changes to be triggered in remaining ‘natural’ systems. That percentage may be knowable only in retrospect, but, judging from landscape-scale observations and simulations66, 67, 68, 69, 70, it can reasonably be expected to be as low as 50% (ref. 68), or even lower if the interaction effects of many local ecosystem transformations cause sufficiently large global-scale forcings to emerge." or in other words, "fuck, I dunno, half?"