Global studies done to date show that negative and positive effects will occur both within countries and across the world. In large countries such as the United States, Russia, Brazil, and Australia, agricultural regions will likely be affected quite differently (Figure 10.4). Some regions will experience increases in production and some declines (e.g., Reilly et al., 2003). At the international level, this implies possible shifts in comparative advantage for export crop production. This also implies that adaptive responses to climate change will necessarily be complex and varied.
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