WASHINGTON, Mar. 17, 2008 ---Every mode of transportation in the United States will be affected by climate change, and planning to keep things running must begin now, says a new report to the government. The greatest potential impact will be flooding of roads, railways, transit systems, and airport runways in coastal areas, due to rising sea levels and surges brought on by more intense storms. Transport on rivers and roads in the nation’s center also are at risk, says the report, issued this week by the National Research Council. A committee of authors warns that climate shifts will require significant changes in design, construction, operation and maintenance of transportation systems.