A woman carries a boy who chooses a book on the mobile library at a kindergarten in Muntang village, Purbalingga, Central Java province, Indonesia November 2, 2021. PA librarian in Indonesia's Java island is lending books to children in exchange for trash they collect in a novel way to clean up the environment and get the kids to read more. REUTERS/Ajeng Dinar Ulfiana

Students line up with their plastic waste to exchange for a borrowed book on the mobile library at a school in Muntang village Purbalingga, Central Java province, Indonesia November 2, 2021. Each weekday Raden Roro Hendarti rides her three wheeler with books stacked up at the back for children in Muntang village to exchange for plastic cups, bags and other waste that she carries back. REUTERS/Ajeng Dinar Ulfiana

Founder of the waste library (Limbah Pustaka), Raden Roro Hendarti, 48, weighs trash in Muntang village, Purbalingga, Central Java province, Indonesia November 2, 2021. She collects about 100 kg (220 lbs) of waste each week, which is then sorted out by her colleagues and sent for recycling or sold. She has a stock of 6,000 books to lend and wants to take the mobile service to neighbouring areas as well. REUTERS/Ajeng Dinar Ulfiana

Students read books at a school in Muntang village, Purbalingga, Central Java province, Indonesia November 2, 2021. They are all carrying trash bags and Raden's three-wheeler quickly fills up with them as the books fly out. She's happy the kids are going to spend less time on online games as a result. REUTERS/Ajeng Dinar Ulfiana

Founder of the waste library (Limbah Pustaka), Raden Roro Hendarti, 48, arranges books on a three-wheeler vehicle at the library in Muntang village, Purbalingga, Central Java province, Indonesia November 2, 2021. REUTERS/Ajeng Dinar Ulfiana

Founder of the waste library (Limbah Pustaka), Raden Roro Hendarti, 48, drives a three-wheeler to bring a mobile library to school in Muntang village, Purbalingga, Central Java province, Indonesia, November 3, 2021. REUTERS/Ajeng Dinar Ulfiana