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71Kyoto Protocol — Participation in the Kyoto Protocol, as of December 2010, Green = Countries that have signed and ratified the treaty              (Annex I II countries in dark green) Grey =… …
72Tragedy of the commons — Cows on Selsley Common. The tragedy of the commons is one way of accounting for overexploitation. The tragedy of the commons is a dilemma arising from the situation in which multiple individuals, acting independently and rationally consulting… …
73Fighting game — This article is about competitive one on one fighting games. For scrolling fighting games where players face off against many opponents, see Beat em up …
74Ozone depletion — Image of the largest Antarctic ozone hole ever recorded (September 2006) Ozone depletion describes two distinct but related phenomena observed since the late 1970s: a steady decline of about 4% per decade in the total volume of ozone in Earth s… …
75Brown dwarf — Brown dwarfs are sub stellar objects which are too low in mass to sustain hydrogen 1 fusion reactions in their cores, which is characteristic of stars on the main sequence. Brown dwarfs have fully convective surfaces and interiors, with no… …
76Heat pump — A heat pump is a machine or device that moves heat from one location (the source ) to another location (the sink or heat sink ), using work. Most heat pump technology moves heat from a low temperature heat source to a higher temperature heat sink …
77Hyperprolactinaemia — Classification and external resources Prolactin ICD 10 E22.1 …
78Sea otter — Taxobox name = Sea Otter status = EN trend = down status system = iucn2.3 image caption = A sea otter wraps itself in kelp in Morro Bay, California. image width = 250px regnum = Animalia phylum = Chordata subphylum = Vertebrata classis = Mammalia …
79Count Nefaria — battles the Avengers on the cover of Avengers #166 (Jan. 1978). Art by George Pérez. Publication information Publisher Marvel Comics …
80Exergy — Available energy redirects here. For the meaning of the term in particle collisions, see Available energy (particle collision) .In thermodynamics, the exergy of a system is the maximum work possible during a process that brings the system into… …
