- Melati and Isabel Wijsen started campaigning against plastic bags in Bali when they were 10 and 12 years old.
- They have since delivered a TED Talk and presented to the United Nations in New York.
(CNN)"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.
Indonesia's plastic problem
Indonesia is the second largest plastic polluter in the world after China -- its plastic waste accounts for a whopping 10 per cent of marine plastic pollution.
The Indonesian government has pledged to invest $1 billion in reducing marine waste by 70 per cent by 2025, as part of the UN's Clean Seas program.