Global Warming Drives up Food Costs?

Bondad's excellent diary "Why are food prices spiking?  " shows that falling food production causes rising food costs.

But why are crop yields falling? Comments in the diary discuss that global warming is a big contributor:

• Global warming goes against the grain - Toronto Globe and Mail, Feb. 24, 2007, projects:

for every 1-degree Celsius increase in temperatures above the mid-30s during key stages in the growing season, such as pollination, yields fall about 10 per cent.

(Affecting places like the US midwest.)

• But per Reuters, March 16 it's already happening:

Global warming has cut about $5 billion worth of the world's most commonly grown grains over 20 years

A study linked to in the Reuters article was the first to estimate how much global food production has already been affected by climate change.  Researchers looked at decades of historical crop yields, and according to Christopher Field, a co-author found that:

warming over the past two decades has already had effects on global food supply.

This recent research was published yesterday (March 16th) in Environmental Research Letters. It states:

...recent climate trends, attributable to human activity [22], have had a discernible negative impact on global production of several major crops.

I am not an ag scientist. Just a concerned citizen. Concerned about the next generation(s).

It is amazing that we still have to keep fighting the battle of "Is it (Global Warming) happening?" here in the US, and not "How can we fix things?"

Bottom line: It's not nice to fool with Mother nature
(cross posted at Myleftwing.com