The problem will be worsened by global warming affecting the population balance of animal predators such as owls, snakes, birds and bats, animals that keep insects and rodents in check.
The world population can balance out at 9 billion in 2050 and oil will be finished.
The bulk of media output tends to be western based and by far the balance of the population is towards the western side of the country.
That, plus the natural aging of Michigan's trapper population could keep supply and demand in balance.
WSJ: Muskrat Love: Exuberant Demand Pays Off for Great Lakes Fur Trappers
It said that "taking in younger immigrants will help us top up the smaller cohorts of younger Singaporeans, and balance the ageing of our citizen population".
It said immigration was needed to help offset a slowing birth rate and ageing population, and it needed to find a balance between the number of Singaporeans and foreigners in order to sustain its rate of economic growth.
But with the help of a guide like Dr Crump, subtle changes in the balance of nature can be observed: with the limpet population practically wiped out by the oil, the particular seaweed they used to feed on was allowed to thrive, changing the look of the rocks.
BBC: News | UK | West Wales recovering from 'environmental disaster'
The influx of "bachelor" labourers has skewed the gender balance: women are now just one-quarter of the population.
Higher fertility rates and immigration produce not only a larger population but a society that is younger, more mixed ethnically and, on balance, more dynamic.
ECONOMIST: Demography and the West: Half a billion Americans? | The
"No one had really focused on that population of athlete, " says Sean Murphy, an advanced products engineer at New Balance.
Rarely addressed in the context of climate change, future population trends could make the difference between success and failure in the long-term balance of human activities, atmosphere, and climate.
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