:*I don't know what you saw, but no, nobody ever seriously suggested temperature swings of 75 degrees in 50 years. Check out the temperature record. The total variation over the last 800000 years is about 10 degrees Celsius (and maybe 12-14 degrees Celsius over the last 5 million years). Yes, 20th century warming is a bit less than 1 degree Celsius/a bit more than 1 degree Fahrenheit. As far as we know, this speed is unprecedented for global average temperature. And we have no million-year temperature record in the article because that would be very irrelevant. Global warming a problem on the scale of centuries to millenia. Human civilization goes back about 10000 years. Humans go back about 100000 years.