Context: Jared Diamond describes an "Evil Quartet" of habitat destruction, overkill, introduced species, and secondary extinctions. Edward O. Wilson prefers the acronym HIPPO, standing for Habitat destruction, Invasive species, Pollution, human over-Population, and Over-harvesting. The most authoritative classification in use today is IUCN's Classification of Direct Threats which has been adopted by major international conservation organizations such as the US Nature Conservancy, the World Wildlife Fund, Conservation International, and BirdLife International.

Question: Who describes the "Evil Quartet"?
Answer: Jared Diamond

Question: What describes habitat destruction, overkill, introduced species, and secondary extinctions?
Answer: Evil Quartet

Question: What describes Habitat destruction, Invasive species, Pollution, human over-Population, and Over-harvesting?
Answer: HIPPO

Question: What is the most authoritative classification in use today?
Answer: IUCN's Classification of Direct Threats

Question: What funding organization uses the IUCN's Classification of Direct Threats?
Answer: the World Wildlife Fund

Question: Who describes the "IUCN"?
Answer: Unanswerable

Question: What describes habitat destruction, overkill, introduced species, and organization extinctions?
Answer: Unanswerable

Question: What describes Habitat destruction, Invasive species, Pollution, human over Population, and Over-conservation?
Answer: Unanswerable

Question: What is the most invasive classification in use today?
Answer: Unanswerable

Question: What funding organization uses IUCN's Classification of Direct Population?
Answer: Unanswerable