Climate has never been constant. So why do we think human activities are responsible for the change occurring now? In recorded history, climates have been both significantly warmer and colder than the present. Biological evidence indicates greater variation within biological time, for example tree stumps deep underwater on the eastern coast of the U.S. presumably from the last ice age and forests under glaciers now receding presumably from some previously hotter time. People with fervent beliefs on either side can not explain their conclusions. Without resorting to authority, what is the convincing evidence?

Added: Dec. 13, 2016, 3:06 p.m. Last change: Dec. 13, 2016, 3:07 p.m.

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