[In the U.S.] each child ultimately adds about 9,441 metric tons of carbon dioxide to the carbon legacy of an average parent – about 5.7 times the lifetime emissions for which, on average, a person is responsible.
-- From "Save the Planet: Have Fewer Kids" by LiveScience Staff, LiveScience 8/3/09
A study by statisticians at Oregon State University concluded that in the United States, the carbon legacy and greenhouse gas impact of an extra child is almost 20 times more important than some of the other environment-friendly practices people might employ during their entire lives — things like driving a high mileage car, recycling, or using energy-efficient appliances and light bulbs.
. . . When an individual produces a child – and that child potentially produces more descendants in the future — the effect on the environment can be many times the impact produced by a person during their lifetime.
Other offbeat environmental impacts have been in the news recently:
The impact of having children differs between countries. While some developing nations have much higher populations and rates of population growth than the United States, their overall impact on the global carbon equation is often reduced by shorter life spans and less consumption. The long-term impact of a child born to a family in China is less than one-fifth the impact of a child born in the United States, the study found.
However, as the developing world increases both its population and consumption levels, this equation may even out.
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Also, see other environmentalists' conclusions about the global warming hazards of childbirth.