During The 800s-1300s AD, Wine Grapes Were Grown At Latitudes Where Polar Bears Now Roam

by K. Richard, April 2, 2018

Canada’s stable-to-increasing polar bear population extends its range slightly further south of the 55th parallel (York et al., 2016).

According to published geological evidence from the 1950s, remnants of wine grape vineyards have been unearthed in regions as far north as the polar-bear-inhabiting 55th parallel during the Medieval Warm Period (~800s to 1300s AD).


Which is the Most Accurate Satellite-Derived Temperature Dataset?

by Christy J.R. et al., April  6, 2018, in CO2Science

Monitoring temperature and creating regional and global temperature data sets is a tricky business. There are many factors that can induce spurious trends in the data; and there are multiple protocols to follow to ensure their proper construction. Consequently, many people (including scientists) have found themselves wondering which of all the temperature data sets is the most accurate for use in determining the impact of rising greenhouses gases on atmospheric temperature? Thanks to the recently published work of Christy et al. (2018), we now have a pretty good idea as to the answer.


Circular reasoning with climate models

by D. Wojick, Ph.D. April 2018 in CFACT, 

Climate models play a central role in the attribution of global warming or climate change to human causes. The standard argument takes the following form: “We can get the model to do X, using human causes, but not without them, so human causes must be the cause of X.” A little digging reveals that this is actually a circular argument, because the models are set up in such a way that human causes are the only way to get change.

The finding is that humans are the cause of global warming and climate change is actually the assumption going in. This is circular reasoning personified, namely conclude what you first assume.

Polar Bear Numbers Are For Kids, Says Specialist Andrew Derocher

by Dr Susan Crockford, April 9, 2018 in ClimateChangeDispatch

Polar bear specialists made global population numbers the focus of the world’s attention when they predicted a dramatic decline and possible extinction of the species.

But now that the numbers have increased slightly rather than declined, the same scientists say global numbers are meaningless: the public should give those figures no credence and anyone who cites global population numbers should be mocked.