Earlier this year, a billionaire investor and philanthropist named Tom Kaplan auctioned off a small Rembrandt drawing of a lion at Sotheby’s in New York City. It sold for nearly $18 million. A press release prior to the auction noted that Kaplan would donate the proceeds of the sale to an environmental organization that he co-founded, called Panthera, which conserves wild cats like lions and jaguars.  At face value, Kaplan’s gift is extraordinarily generous. Kaplan, owner of the world’s largest