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The low estimate seems to have been on the money.

Didn't even break onto the chart for the lowest number in the lowest estimates. I wouldn't call that "on the money."

Was Brown predicting a rise in Celsius or Fahrenheit? The article doesn't say. (And we are up by ~1.5 degrees Fahrenheit.)

1 Fahrenheit degree is .555... centigrade degrees.

High estimation is still over 700% of.