There was a world temperature spike in 1945, which I believe was caused by the firebombing of German and Japanese cities at end of World War Two.
http://www.answers.com/topic/bombing-of-tokyo-in-world-war-ii
A graph of this spike is here,on a DailyKos story, third image from the top. (I do not know how to post an image)
http://www.dailykos.com/story/2005/3/14/164621/727
(subsequent smaller spikes also seemed timed to the firebombing in Korea and the nuclear atmospheric testing crescendo (just prior to the test ban treaty).
http://www.nautilus.org/fora/security/0503A_Cumings.html
http://nuclearweaponarchive.org/Usa/Tests/
More evidence for the intelligent.
As Linus Pauling used to say "Do we have good evidence for that?" (global warming)
I believe the answer is yes
What do you think?