many krathongs for loy krathong festival in thailand floating on dirty river that cause by people throw krathong on river

loy krathong river waste pollution dirty garbage water environment junk full moon festival ecology disposal flower petal candle incense joss stick peng night thailand chiangmai sukhothai bangkok park trash background ancient asia banana leaf ceremony handmade craft belief blossom buddhism celebrate culture event float floral holiday november religion respect tradition krathongs floating cause people throw river