Chad: 4 by 4's cause duststorms

Dust storms emanating from the Sahara have increased tenfold in 50 years, contributing to climate change as well as threatening human health and destroying coral reefs thousands of miles away. And one major cause is the replacement of the camel by four-wheel drive vehicles as the desert vehicle of choice. Andrew Goudie, professor of geography at Oxford University, blames the vehicles for destroying a thin crust of lichen and stones that has protected vast areas of the Sahara from the wind for centuries.