A number of indicators on one graph. The gold, lead and zinc refer to raw ore grade in terms of ounces of metal per tonne of rock.
The forest, fisheries and megafauna biomass curves represent biomass per person. These projections assume a stable human population out to the year 2100.
Fertility: Total number of children per woman. 2.1 is replacement level.
Immigration: Annual net immigration as a percentage of the population. Currently in Canada, immigration is running at the 0.8% to 1.0% level.