Liz Zetlin continues with this month's Plastic Challenge thinking about the humble, ubiquitous, plastic straw.

Day 18 Plastic Challenge - on our walk along the harbour, we saw this plastic cup with straw leaning against the garbage bin. OK, maybe the trash was full when this got left? If not, no words . . . Barbara gets "Trash the Trash" award.

Day 21 Plastic Challenge - think twice about that straw. OMG! In the U.S. alone, people discard 500 million straws every day.