Melati and Isabel Wijsen: Our campaign to ban plastic bags in Bali

TED 2015
Melati and Isabel Wijsen: Our campaign to ban plastic bags in Bali  (script)
Summary
You are sure you imagine that Bali is beautiful.
In order not to change this image, next time, when you go there, you can't bring a plastic bag. It'll be declarable in the airport.
In Bali, two kids who were only 10 and 12 years old started no plastic bags activity in 2012.
It is because, they also imagined that Bali was a beautiful place though they knew that 680 cubic meters of plastic garbage was generated a day. It is mostly not recycled but it is thrown away in the ocean through the drains. They thought how their home island became.
They knew that this is a big problem though they launched of "Bey Bey Plastic Bags." They made a presentation many time in various places, and continued for three years. They tried not to eat from sunrise to sunset every day until the governor of Bali would agree to meet with them to talk about how to stop plastic bags on Bali.
They finally got a promise to help the people of Bali say no to plastic bags.
Their activity is great, further, they tell us the lessons since they learned this on TED stage. The lessons: you cannot do something that is a little bit big all by yourself. You have to think outside the box and have patience. You need champions at all levels of society.  You can also learn leadership, teamwork, responsibility,  friendship and about your hometown and culture are important again.
It's not always easy. It's difficult to understand each other, but even kids could do that and they still have a lot of work to do. There is no need for you to wait for something.
Words in this story
declared / say something in a solemn and emphatic manner.
conversely / introducing a statement or idea that reverses one that has just been made or referred to.