A、By establishing clothing companies with others. B、By gambling on an investment. C、By writing economic books. D、By doing public

The American billionaire and environment activist Douglas Tompkins has died after a kayak accident in Chile. He developed sever hypothermia after capsizing in a lake. He was 72. (3)Douglas Tompkins made his fortune as co-founder of the clothing companies North Face and Esprit. Here’s James Reed. "In his own words, Douglas made his fortune selling people countless things they don’t need. He co-founded the clothing brands North Face and Esprit. (4)But in the late 1980s, he turned his back on business to dedicate himself to conservation in Patagonia. He spends hundreds of millions of dollars on land in Chile and Argentina to establish vast nature reserves. The scheme was controversial, seen by some as a threat to economic development and even national sovereignty. But for Douglas Tompkins, preserving biodiversity trumped all. He died in the pristine wildness he loved and was so determined to protect. "
3. How did Douglas Tompkins make his fortune?
4. What did Douglas Tompkins do in the late 1980s?