Expert says problem isn’t just population, it’s lifestyle
Our most pressing environmental challenge is not how many people the planet can support, but rather how many cellphone-toting, satellite-TV-watching, gas-guzzler driving members of the middle class it can bear.
That was the message from Sir David King, former science adviser to the British government, chancellor of the University of Liverpool, and director of research in physical chemistry at the University of Cambridge, who spoke at Harvard’s Science Center on April 17.
While global population growth has been important over the last century, as the number of humans climbed from 1.5 billion in 1900 to some 7 billion today, average female fertility has declined to the replacement value of 2.1 births, King said. While a significant increase of some 2 billion people is still expected as today’s children reach childbearing age, lifestyle changes are the greater challenge, he said.
The global middle class — defined as those who spend between $10 and $100 per day — has climbed rapidly, reaching 1 billion in 2000 and doubling to 2 billion just recently. The middle class is expected to reach 4.8 billion by 2050, raising the question of whether the planet has the resources to deliver the lifestyle people will expect.
“Improving Human Well-Being on a Resource-Limited Planet: Can We Do It?” was sponsored by the Harvard University Center for the Environment and was part of its “Future of Energy” lecture series. King was introduced by the center’s director, Daniel Schrag, Sturgis Hooper Professor of Geology and a professor of environmental science and engineering.
There are already signs the growing middle class is prompting increased competition for resources in global markets for oil, food, and minerals, King said. Fresh water sources are strained, including both surface water and aquifers. Some water-poor nations have turned to desalinating seawater, an energy-intensive process, with the energy often provided by coal.
King pointed to continued high commodity prices during the global economic downturn as evidence that global capacity is being strained. During the Great Depression, commodity prices collapsed as economic activity in industrialized nations declined; cheap commodity prices then helped fuel the economic recovery, King said.
In the most recent recession, commodity prices have stayed high, likely as a result of increased demand from the growing global middle class, largely in Asia and the Pacific, but increasingly in Africa as well, he said.
Oil prices’ response to supply and demand appears to have changed since 2005, King said. Prices spiked to $140 a barrel and have remained high despite the economic downturn, another sign of increased global demand. High oil prices have hurt the economies of Italy and Greece, he said, and are threatening Britain as its North Sea oil production declines.
The direct cost of imported oil in the United States, he said, is $1 trillion a year, but there are indirect costs — like the trillions spent on the Iraq War — that can be attributed to the need to maintain oil supplies.
“The impact of oil is massive,” King said. “The question is whether the economies of the world can operate at this price, $100 a barrel.”
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