Consider crops in weather studies

I guess the real concern is not global warming or cooling, as our meager 300 years of weather records are hardly significant, but the crux is whether human activity is responsible to some degree for the increased weather instability of the last 50 years. And if it is, what can be done about it?
Alberta has a widely varied weather norm, and I can attest that it has gotten more unstable than usual. Having experienced huge temperature fluctuations within a day, two tornados and two once-in-200-year floods, I would suggest that something is causing the increased weather instability.
I suppose it is proper to question whether human activity is the source of the problem.
But then one might ask, what constitutes weather instability? Is it a one-, 10-, 100-, 1,000- or 10,000-year trend?
To a fruit fly, a one-day trend might be devastating.
Perhaps concerns about global weather instability should focus on when global crop production is affected. That’s when you know we’ve got a big problem, isn’t it?
In addition to crop quantities, we need to pay attention to quality.
Is anyone even studying this aspect?
Alfred Jonas
Red Deer