Okay, everybody join me in grabbing a big ol' Hefty bag and let's head for the hills.There's a mountain of trash on the world's tallest mountain and Nepali officials have had it. In an effort to help clean up Mount Everest, new regulations require climbers to bring down at least 18 pounds of their personal garbage and hand it over to security at base camp. In the past 60 years it is estimated that the 4,000 climbers who have scaled the 29,000-foot  peak have left tons of trash, from food wrappers to tents. So Nepal says enough is enough.  If you bring down less than 18 pounds of trash the penalty is a cage match with a yeti. DB