Drought, Lightning, and the Sun ...

27 May 2010

At www.physorg.com/print194030525.html tree rings have been used to compile a temperature proxy over 1000 years in NW Africa (Morocco, Algeria and Tunisia) and they show dry periods of climate in the 13th and 16th centuries - also in the late 20th century. They appear to coincide with warmish weather in northern Europe - droughts are virtually absent after around AD1500 - for about 400 years