17 agosto 2015
Prior to the advent of human-caused global warming in the 19th century, the surface layer of Earth’s oceans had undergone 1,800 years of a steady cooling trend, according to a new study. The results also indicate that the coolest temperatures occurred during the Little Ice Age — a period that spanned the 16th through 18th centuries and was known for cooler average temperatures over land.
http://www.sciencedaily.com/releases/2015/08/150817132013.htm
