Unearthing pristine nature

HE may be 70 this year, but the legendary documentary photographer Sebastiao Salgado is not about to retire his trusty cameras any time soon.

"I don't know how long I will keep doing this, but photographers live long," says the Brazilian national, with a chuckle. "I knew a lot of photographers who were 85, 90 years old and still going strong. That means I'll probably go on for a while ... it's not a problem of age, it's all in your mind."

In fact, Salgado's latest exhibition, a show of 245 pictures called Genesis, took him eight years of trekking …