Originally Posted by BucEyedPea
Summers are short up North. Not all scientists agree with your claims on the rest. In fact, trees, something environmentalist love to see grow more. I don't recall reading about many trees when glaciers covered us.
You are all over the place. I make a point about reciprocation (essential for the better agricultural production) and you bring up
1. short summers
2. some undocumented claims about some scientists without going into their methods (if you want to play that game, I'm more than willing)
4. Glaciers covering us.
Let's focus on precipitation and food crops. Most climate models show shifting patterns of precipitation: longer and more frequent droughts combined with more severe storms. Crops don't do well under these conditions. Do you want to produce references to scholarly articles that dispute this aspect of crop production?
After that we can look at the fact grain crops don't produce as much grain when they grow fast (lower yield). And weeds and pests thrive under warmer conditions. But let's deal with precipitation first.