Some say the earth isn't warming, some say it's natural variation; though they can't produce a single example of climate changing this fast globally before.
Actually the temperature variations we have had since the industrial revolution (lets say the last 250 years) have been quite benign compared to the past of rapid cooling and rapid heating of the climate. (lets assume no human influence)
https://en.wikipedia.org/wiki/Dansgaard–Oeschger_event
In the Northern Hemisphere, they take the form of rapid warming episodes, typically in a matter of decades, each followed by gradual cooling over a longer period. For example, about 11,500 years ago, averaged annual temperatures on the Greenland ice sheet warmed by around 8 °C over 40 years, in three steps of five years (see,[3] Stewart, chapter 13), where a 5 °C change over 30–40 years is more common
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