Mother Nature group members were prosecuted in 2021 when they recorded rubbish discharge into the Tonle Sap river in Phnom Penh, which is close to the royal palace.
Alejandro Gonzalez-Davidson, a Spanish co-founder, was among the three who were found guilty of insulting the king and received an eight-year jail sentence along with a $2,500 (£1,980) fine. Six-year terms were given to the other seven people.
The prosecution has never provided clarification on the activists’ alleged infractions of the statute that forbids slandering the king or hatching plots against the government.
Since its establishment in 2013, Mother Nature has fought against initiatives that harm the environment and raised concerns about the management of natural resources.
They have 457,000 Facebook fans, and they use lighthearted and educational films to share their discoveries.
Environmental organizations have long accused Cambodian officials of misusing the natural resources in their nation. The administration contests this, stating that Mother Nature is the source of social unrest.
Gonzalez-Davidson referred to the ruling as a “disastrous decision by the Hun family regime” after previously being prohibited from visiting Cambodia.