According to the Intergovernmental Panel On Climate Change (IPCC) (A good read if you want to learn the most accurate concensus on climate change), climate change will cause a shift and unpredictability in weather patterns throughout the world. Basically, any farm that has proper irrigation, drainage, and wind breaks will fare better than those without (which includes probably about 99% of the subsistance farms in the world). In addition, raising temperatures will cause a northern shift in species. For example, parts of Canada which were unfarmable will become farmable. Pest species will also start moving to areas where they could not survive. That means that there will probably be an increase in pesticide use on many farms. In my personal experience in Montreal, there is a new species of snail that has invaded many gardens here, that was never here before, due to increase in temperature.

In conclusion, the farms in developed coutries (America, Canada, Europe, etc.) will need to increase spending on the improvement of infrastructure (drainage, irrigation) as well as prepare for changes in pest control methods.

Developing countries will unfortunately be at the mercy of the weather, as most farmers there do not have sufficient capital to invest in infrastructure. There will be serious disruption in the farming systems of Africa and other arid regions.
Source(s):
http://www.ipcc.ch/


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