Causes - NASA Science

Past Climates & Climate Change

A Knoxville machine is turning pollution on its head, inhaling CO2 instead of releasing it

Earth’s five mass extinctions

🔹 Climate Change “There have been five major extinctions during the life of planet Earth; the Ordovician, Devonian, Permian, Triassic, and the Cretaceous. All previous extinctions were due to climate change, the cooling of the oceans, the eradication of sunlight from volcanic eruption, or asteroid impact. A majority of scientists now believe that we are well into the sixth mass extinction (Holocene) on Earth. However, the current cycle is due entirely to human impact upon the planet and is happ