Across the United States, various regions are already experiencing the effects of climate change.

Much discussion about adaptation to climate change has focused on strengthening infrastructure such as roads and bridges or in building physical protection such as sea walls.

Climate policy used to be seen as either concentrating efforts on mitigating greenhouse gas emissions or adapting to a changing environment.

U.S. agriculture supplies a major share of basic calories to the world. Recent research suggests that even with current agricultural technology, climate change could dramatically reduce agricultural productivity in the United States. What might be the impacts of such shifts?