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Practice English Speaking&Listening with: Global Population Dynamics

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Now that we understand the way populations may change over time,

we need to consider how population, development,

and environmental degradation are linked.

There are stark differences in resource consumption in developed

and developing countries.

People in developed countries tend to have a larger environmental impact

than people in developing countries.

The IPAT equation is a way to represent human impact

as a function of population and affluence.

The formula is Impact, I, equals Population, P, times Affluence, A,

times Technology, T. We don't actually multiply out those factors,

but they do contribute together to give you an indication of the impact.

Greater population requires more resources,

so two people consume twice as much as one person.

So the bigger the population, the more consumption of resources.

Affluence is created by economic opportunity.

A wealthy person in the developed world who has two cars and a swimming pool

has a greater environmental impact than a poor person who's

living without electricity, perhaps in the developing world.

Technology can degrade the environment and it can also prevent pollution.

Initially, technological improvements tend

to lead to more consumption and more environmental harm.

However with more technology, you can build a hybrid car

that may decrease greenhouse gas emissions.

So technology can both increase and reduce environmental impact.

These are some of the parameters and some of the factors

we need to evaluate when considering the human population and our impact

on the natural world.

The Description of Global Population Dynamics