And every single one of them was caused by CO2, dadgummit. CO2 is the reason the planet is spinning the wrong way, it's why people are lactose intolerant, male pattern baldness and teenage pregnancies.This is all dynamics ... the push and pull of the high and low pressure systems ... nothing unusual about what you describe ...
The first well documented drought in California was in the 1880's ... wiped out the cattle business that was thriving at the time ...
The drought of the 1920's wiped out the fledgling wheat business ... but Them the People got smart and hardened their water systems ...
Thus, the drought in the 1970's didn't actually wreak the economy ... we had enough water stored to get us by ... (barely) ...
The drought in the 2010's wasn't any worse than the one I lived through in the late 1970's ... the difference was so much more land planted into agriculture ... where the almond and pistachio trees stood naked and dead in 2012 was open prairie in 1979 ...
There's reason to believe this has been occurring since long before Europeans arrived ... long before humans starting burning much coal ...