claim: From 1970 until 1998 there was a warming period that raised temperatures by about 0.7 F that helped spawn the global warming alarmist movement.
evidence: The Paleocene–Eocene thermal maximum was an approximate 200,000 year long event where the global average temperature rose by some 5 to 8 °C ( 9 to 14 °F ), and mid-latitude and polar areas may have exceeded modern tropical temperatures of 24–29 °C ( 75–84 °F ).