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Bearly answers questions: Earth-system process Parameters Proposed boundary Current status Pre-industrial value<BR>
Climate change (i) Atmospheric carbon dioxide concentration (parts per million by volume) 350 400 280<BR>
(ii) Change in radiative forcing (watts per metre squared) 1 1.5 0<BR>
Rate of biodiversity loss Extinction rate (number of species per million species per year) 10 >100 0.11<BR>
Nitrogen cycle (part of a boundary with the phosphorus cycle. 
Amount of N2 removed from the atmosphere for human use (millions of tonnes per year) 35 121 0<BR>
Phosphorus cycle (part of a boundary with the nitrogen cycle)
Quantity of P flowing into the oceans (millions of tonnes per year) 11 8.59.5 ~1<BR>
Stratospheric ozone depletion Concentration of ozone (Dobson unit) 276 283 290<BR>
Ocean acidification Global mean saturation state of aragonite in surface sea water 2.99 2.90 2.00<BR>
Global freshwater use Consumption of freshwater by humans (km3 per year) 4,000 2,600 415<BR>
Change in land use Percentage of global land cover converted to cropland 15 11.7 Low<BR>
Atmospheric aerosol loading Overall particulate concentration in the atmosphere, on a regional basis
To be determined<BR>
Chemical pollution For example, amount emitted to, or concentration of persistent organic pollutants, plastics, endocrine disrupters, heavy metals and nuclear waste in, the global environment, or the effects on ecosystem and functioning of Earth system thereof

How far can humans change Earth? ? To be determined...
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