WHAT is
your carbon legacy - not the emissions you are personally liable for, but those
of your descendants? Ask Paul Murtaugh, a
statistician at
If you
have a child, he says, you and you partner are each responsible for half its
emissions. If that child has kids, one-quarter of their emissions are down to
you, and so on. How it adds up depends on population trends and emission
changes in the future.
Murtaugh
used UN population projections, which say that after 2050, birth rates in all
countries will be 1.85 children per woman, on average. Then he took three
emissions futures: rising business-as-usual emissions, constant emissions, and
"save-the-planet" levels that fall to half a tonne
of CO2 per capita per year by 2100.
With
rising future emissions, each extra child in the
In the
shrinking-emissions scenario, the