Science and Politics: An A-to-Z Guide to Issues and Controversies"Given the scope and scale of climate change, effective steps to mitigate impacts (reduce sources or enhance sinks of greenhouse gases) will have major economic and political consequences. And, as with any scientific issue as complex as climate change, there are built-in uncertainties as well as underdeveloped methods for predicting future changes in climate. Together, these forces have combined in a fierce political battle regarding policy response to climate change."