Meteorological hypotheses

extinction event ending the Mesozoic Era

widespread and rapid decrease in the amount of life on earth

mass extinction event at the end of the Permian Period approximately 250 million years ago

paradigm that living organisms interact with their surroundings in a self-regulating system

worldwide glaciation episodes during the Cryogenian Period of the Neoproterozoic Era

Paleoproterozoic surge in atmospheric oxygen

planetary low-orbit debris hazard

phenomenon observed sporadically during the summers in the southern Indian state

A hypercane is a hypothetical class of extreme tropical cyclone that could form if sea surface temperatures reached approximately , which is warmer than the warmest ocean temperature ever recorded. Such an increase could be caused by a large asteroid or comet impact, a large supervolcanic eruption, a large submarine flood basalt, or "incredible" global warming. There is some speculation that a series of hypercanes resulting from the impact of a large asteroid or comet contributed to the demise of the non-avian dinosaurs. The hypothesis was developed by Kerry Emanuel of MIT, who also coined the

hypothesis that climate change can trigger a release of methane buried in seabeds which leads to runaway warming

use of weather modification techniques such as cloud seeding for military purposes

hypothesis that multicellular life, understood as a superorganism, is suicidal, and that microbial-triggered mass extinctions are attempts to return the Earth to a microbial-dominated state