Yes indeed a well written paper. However on the mention of food, you forgot one important factor everyone is forgetting. A paper was written on "Assessing Terrestrial Ecosystem Sustainability" by Mohan K Wali et al at Ohio State U in Nature & Resources Oct-Dec 1999 pg 21. And it states:

As temperature rises, photosynthetic activity in plants increases until the temperature reaches 20 C. The rate of photosynthesis then plateaus until the temperature hits 35 C , where upon it begins to decline until at 40 deg C photosynthesis ceases entirely. Since we here in southern ontario Canada live in the heart of corn and diary farming, it will be interesting to see the fall harvest crop reciepts and volumes.

On a personal note, we planted 40 peaches and cream corn stalks and watered(rain barrels) religiously every night and only harvested 15 cobs of corn. Every plant in the garden didn't to good except the carrots and the spinach. Yet we have smashed record high temps all summer 32 - 38 C.

20C 68F
35C 95F
40C 104F

increase, plateau, decline, familiar words?
Regards
OCB

There are some awesome wineries in Ontario. My husband and I spent a few days in Niagara on the Lake and toured some of the wineries. I was stunned at how good the wines are!

Interesting about the corn and spinach. I have a very intensive garden plot in Washington DC; I'd have rain barrels (but they don't work in a drought).

This year I had lots of spinach and almost no corn. No peaches from my two super dwarf peach trees although I'm not sure if that was due to the heat, lack of water, or lack of bees.

I've heard others (500 miles north in New England) with similar stories.

Bob in DC
~live sustainably~