Climate change and global warming/cooling are the constant factors of Earth's history regardless of human CO2 emissions - a new study confirms that unprecedented Medieval and Roman period temperatures in the New Mexico area were significantly warmer than current
(click on image to enlarge)
Read here. The empirical research for the unprecedented temperatures during the Roman and Medieval periods continues to build.
As this chart depicts, the New Mexico region of the southwest U.S. experienced considerably warmer temperatures than those of the modern era.
As can be seen, extreme climate change took place frequently in the past, well before any influence of humans on the landscape and the atmosphere from CO2 emissions.
A paper published in Palaeogeography, Palaeoclimatology, Palaeoecology reconstructs climate change in central New Mexico, USA over the past 12,800 years and finds mean annual temperatures were ~1°C warmer than the present during the Roman Warming Period 2,000 years ago, the Medieval Warming Period 1,000 years ago, as well as during other unnamed warming periods in the past. The paper also shows cold periods were relatively wet, and warm periods relatively dry, the opposite of the claims of climate alarmists. Furthermore, the paper shows that mean annual precipitation today is neither dry nor wet in comparison to the precipitation extremes over the past 4,000 years. [Stephen A. Hall, William L. Penner 2012: Palaeogeography, Palaeoclimatology, Palaeoecology]