earth’s mean temperature over the last 2,000 years shows two previous periods when temperatures were warmer than they are now; from 1–200 a.d., an epoch called the roman warm period, and more recently the medieval warm period from 900–1100 a.d.
earth’s mean temperature over the last 2,000 years shows two previous periods when temperatures were warmer than they are now; from 1–200 a.d., an epoch called the roman warm period, and more recently the medieval warm period from 900–1100 a.d.
medieval warm period:13
1200 ad, and was followed by a decline of temperature levels till between c. 1500 and c. 1700 the coldest phase since the last ice age occurred."