Douglas Tomkins Enviromental Investor in South America The American multi-millionaire who founded the North Face and Esprit clothing lines has said he is trying to save the planet by buying bits of it. First Douglas Tompkins purchased a huge swath of southern Chile, and now he’s hoping to save the northeast wetlands here in Argentina. He has snapped up more than half a million acres of the Esteros del Ibera, a vast Argentine marshland teeming with wildlife. Tompkins aged 64, is a hero to some for his…