"These are challenging times, filled with big worries: wars and rumors of wars, possible epidemics of infectious diseases, droughts, floods, and global warming. Seacoast cities are concerned with the rising level of the ocean, which will bring ocean tides to their doorsteps or over their thresholds. Global warming is also affecting agriculture and wildlife. Nations whose prosperity depends on world peace and free trade worry about disturbing developments that threaten either or both of these."