gwent

"There are almost as many definitions of deserts and classification systems as there are deserts in the world. Most classifications rely on some combination of the number of days of rainfall, the total amount of annual rainfall, temperature, humidity, or other factors. In 1953, Peveril Meigs divided desert regions on Earth into three categories according to the amount of precipitation they received. In this now widely accepted system, extremely arid lands have at least 12 consecutive months without rainfall, arid lands have less than 250 millimeters of annual rainfall, and semiarid lands have a mean annual precipitation of between 250 and 500 millimeters. Arid and extremely arid land are deserts, and semiarid grasslands generally are referred to as steppes"

http://pubs.usgs.gov/gip/deserts/what/

As I understand it Carberry gets 300-500 mm of rain per year.

Note: I buy into global warming, but that video was terrible and only manages to worsen the case for global warming.

He claims people are global warming deniers and uses ice cores to prove the case, only he's an idiot for not realizing that MOST of the people he's referring to are not denying that the earth is warming up, rather they're clearly saying that it is the impact/outcome where there is a disagreement.

He consistently and unjustifiably uses answers for peripheral problems to debate core arguments which only destroys his credibility. I could only watch for so long... I just had to stop, it was hurting that much.