common water hyacinth and many garbage on surface of water of choa praya river in bangkok, thailand

bangkok choa clean common contaminated contamination corrosion crassipes damage danger dangerous destroy destruction dirty disaster disposal ecology eichhornia environment environmental floating foam garbage global hyacinth junk many natural nature oil plant plastic poison pollute polluted pollution poor poverty praya problem recycle recycling reduce river rubbish sewage substance surface thailand trash treatment tree warming waste water