The mellow, "peace now," countercultural, environmentally conscious “420” celebration deposited 10,000 pounds of garbage on what is known as Hippie Hill in Golden Gate Park, leaving volunteers and park workers to clean up the mess. According to the San Francisco Chronicle’s website SF Gate, this year’s celebration drew a massive amount of revelers estimated at between 10,000 and 15,000. The pot smokers' untidiness will cost the city more than $10,000 in cleanup costs. The immense load of empty bags of chips, candy wrappers, and snack containers left behind was evidence that it was indeed the remnants of weed smokers with...