by  Renee Hannon, March 28, 2018 in WUWT

In the mid-1900’s many scientists were suggesting the Earth was cooling. Now scientists are forecasting global warming. Indeed, instrumental data shows global temperatures warmed by approximately 1-degree C during the past 165+ years. With warming rates of 0.5 to over 1.3 degrees C per century this has caused considerable alarm for many. This recent warming is commonly attributed to increasing greenhouse gases, primarily CO₂.

This post examines natural paleoclimate trends and simple characteristics of past and present climate cycles at different time scales.