text:  It's Morning Edition from NPR News. I'm Sasha Pfeiffer. And I'm A. Martinez. Can you go a whole month without using any plastic? Well, that's the challenge issued by the Plastic Free Foundation, a nonprofit based in Australia. This month, they're calling on people all over the world to avoid single-use plastics. About a quarter of those plastics will end up as litter, according to Oxford University's Our World in Data.