To stay within safe planetary boundaries, humans should only use around 10 per cent of the biomass produced each year by plants on land, but we are currently way above that level
– is the most important of these boundaries, says Richardson. Back in 2009, it was clear that the loss of genetic diversity due to our actions had already reached dangerous levels, but the team was unable to find a good measure of how the functioning of the biosphere has been affected.produced by photosynthesis is being appropriated by humans, or is no longer happening, relative to pre-industrial levels.
The study estimates that plants on land produced 56 gigatonnes of biomass a year, as measured by its carbon content, in pre-industrial times, and that through farming, logging, the grazing of domestic animals and so on, people now take 17 gigatonnes per year, or around 30 per cent of pre-industrial levels.
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