The climate in the northern hemisphere was much colder in the late 1700s than in the 20th century, with large American rivers like the Delaware routinely freezing over during the winter. If you lived back then, would you demand that the climate be “protected” at its then-current state? With reference to the above, how do you determine the optimal “global” temperature? Greenland during the period of roughly 1100-1700 was warmer than it has been since, and it supported European settlements for hundreds of years. After subsequent centuries of colder temperatures and expanding glaciers, why should we now be anxious if Greenland … Continue reading →