Get ready for a rocky year. From now on, rising prices, powerful storms, severe droughts and floods, and other unexpected events are likely to play havoc with the fabric of global society, producing chaos and political unrest. Start with a simple fact: the prices of basic food staples are already approaching or exceeding their 2008 peaks, that year when deadly riots erupted in dozens of countries around the world. It’s not surprising then that food and energy experts are beginning to warn that 2011 could be the year of living dangerously — and so could 2012, 2013, and on into the future.