Why Were So Many Prehistoric Animals So Big? - HowStuffWorks "For comparison, there is 21 percent oxygen in today's atmosphere We really don't know what might have caused this increase, but we also see a drop in CO2 levels at that time " Around this same time the oxygen peaked, the first dinosaurs appear in the North American tropics and the massive sauropods soon followed
Fact Sheet: Global Species Decline - Earth Day The world is facing a mass extinction of species All species of mammals, birds, reptiles, amphibians, arthropods (insects and arachnids), fish, crustaceans, corals and other cnidarians, and plants have declined, in many cases, severely Human civilization has had a negative impact on most living things We are currently living through a mass species extinction […]
Global vulnerability of marine mammals to global warming Intrinsic sensitivity to global warming We evaluated the intrinsic sensitivity of marine mammal species to ocean warming using a trait-based approach 40,45,46,47,48 The species sensitivity to
IUCN Red List - Wikipedia Russ Mittermeier, chief of Swiss-based IUCN's Primate Specialist Group, stated that 16,306 species are endangered with extinction, 188 more than in 2006 (total of 41,415 species on the Red List) The Red List includes the Sumatran orangutan ( Pongo abelii ) in the Critically Endangered category and the Bornean orangutan ( Pongo pygmaeus ) in
Extinction Is Not Inevitable. These Species Were Saved. Conservation efforts have saved up to 48 mammal and bird species since 1993, but scientists say much more is needed to stem biodiversity loss Today, more than 760 Przewalski’s horses roam