If Man Made Global Warming is True....

If Man Made Global Warming is true and it is caused by Co2 emissions in the atmosphere from industrialization, which decade was warmer the 1930's or the 1940's? 

Let's think - the 1930's were the Great Depression - lot's of government spending - huge debts - no jobs or industry.  Not a whole lot going on in the industrialized world.

Fast forward to the 1940's - massive industrialization to boost the war effort, pollution, bombing, nuclear explosions, post war boom, cars, factories and explosion in Co2 emissions.

The current "consensus" says that the 1940's should be much hotter than the 30's, but the exact opposite is true.  The 1930's were markedly hotter.  As a matter of fact in the post war 1940-1980 the earth cooled, so much so that the scientists proclaimed a new "Ice Age".

I am no climate scientist, but whenever I see inverse correlations, I begin to doubt the conclusions of scientists that disregard the facts.