Alternatively, they can be turned into very hard alloys, referred to as a martensitic
phase, by subjecting them to extremely
rapid cooling.
In 1975 Wallace Broeker (the guy who first used the phrase «global warming», predicted a
rapid transition to warming in the 1980s, caused by a combination of rapidly rising CO2 emissions and a natural temperature cycle (derived from work on Greenland ice cores at Camp Century) which showed a
rapid warming
phase up to 1940, followed by the
cooling phase which was attenuated by CO2.