"Welcome to Bali! Do you have any plastic bags to declare?"
If you’ve traveled to the lush Indonesian island of Bali recently, you might have received this peculiar greeting at the airport.

It would have come from Melati and Isabel Wijsen who have been campaigning for four years to get plastic bags banned from their island.
When they started out, they were just 10 and 12 years of age.
And now, they’re about to succeed.