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Guardian Unlimited %7C Special reports %7C 4x4s replace the desert camel and whip up a worldwide dust storm: "4x4s replace the desert camel and whip up a worldwide dust storm %0D%0A%0D%0AWinds carrying 3bn tonnes a year threaten environment and human health %0D%0A%0D%0APaul Brown%2C environment correspondent%0D%0AFriday August 20%2C 2004%0D%0AThe Guardian %0D%0A%0D%0ADust storms emanating from the Sahara have increased tenfold in 50 years%2C contributing to climate change as well as threatening human health and destroying coral reefs thousands of miles away. %0D%0AAnd one major cause is the replacement of the camel by four-wheel drive vehicles as the desert vehicle of choice. %0D%0AAndrew Goudie%2C professor of geography at Oxford University%2C blames the process of Toyotarisation - a coinage reflecting the near-ubiquitous desert use of Toyota Land Cruisers - for destroying a thin crust of lichen and stones that has protected vast areas of the Sahara from the wind for centuries. "