Greta Thunberg's protest started small.

In September 2018, hoping to push her government to take urgent action against climate change, the then-15-year-old sat outside parliament in Stockholm for three weeks and next to her was a sign that read: "School Strike for the Climate".

Since then, she has continued with her protest, which she called "FridaysForFuture", bringing along hundreds of thousands of school students and others around the world with her.

This week, as more than 5,000 protests across the world are expected ahead of the United Nations' Climate Action Summit next week, we profile young climate change activists and environmentalists making a difference in the Middle East and North Africa.

Cick here to read about a Tunisian fighting plastic pollution. A young Turk, opposed to mining. And Iranians, jailed for trying to save cheetahs. The battle against the climate crisis starts here.