This study suggests that the cause of the stagnation in global warming in the mid 20th century was the atmospheric nuclear explosions detonated between 1945 and 1980.

http://www.sciencedirect.com/

I have suggested this idea before

https://stevengoddard.wordpress.com/

The interesting thing about this idea is that if it is correct, Tamino’s period of modern warming is just a rebound from the end of atmospheric testing. The rate of warming since 1940 drops to 0.4C/century.