In a study published today in Current Biology, researchers announced that the world had lost one-tenth of the wilderness that it had in the 1990s. They came to the conclusion after comparing a map of wilderness areas made in the early 1990s, to a map made using the same methods, today. They found that wilderness areas (areas where humans have not disturbed the landscape) had decreased by 1.27 million square miles, or about the size of Alaska. Most of those losses occurred in the Amazon and Africa, where economic interests are clashing with conservation goals. As it is, the researchers estimate that about 23.2 percent of the Earth's land surface remains wilderness.