In a personal plea sent to tens of thousands of schools around the world Wednesday, Amnesty International secretary general Kumi Naidoo called on educators and administrators to allow students to join global climate strikes later this month.

"The climate emergency is the defining human rights issue for this generation of children."

—Kumi Naidoo, Amnesty International

"I believe that the cause for which these children are fighting is of such historic significance that I am writing to you today with a request to neither prevent nor punish your pupils from taking part in the global days of strikes planned for September 20 and 27," wrote Naidoo, whose letter has been sent to school officials in Canada, Hungary, Spain, New Zealand, and the United Kingdom.

Inspired by the Fridays for Future school strikes that launched last year—for which students worldwide have taken to the streets to demand that governments pursue more ambitious climate policies—campaigners of all ages have registered thousands of events across the globe that coincide with an upcoming United Nations climate summit in New York City. The week of action will be bookended by the strikes Naidoo mentioned in his letter.

The climate emergency is the defining human rights issue for youth today. It will shape their lives in every way. That's why I've written to more than 30,000 schools around the world urging them to let pupils join the historic climate strikes on the 20th & 27th September. pic.twitter.com/ATJamTVpe0 — Kumi Naidoo (@kuminaidoo) September 11, 2019

"The climate emergency is the defining human rights issue for this generation of children," wrote the leader of the world's largest human rights group. "Its consequences will shape their lives in almost every way imaginable. The failure of most governments to act in the face of overwhelming scientific evidence is arguably the biggest inter-generational human rights violation in history."

"By taking part in these protests, children are exercising their human rights to freedom of expression, peaceful assembly, and to have a say in decisions and matters that affect their lives," he continued. "In doing so, they are teaching us all a valuable lesson: the importance of coming together to campaign for a better future."

Naidoo has long history of campaigning for social justice issues. He became the head of Amnesty in December of 2017, after serving as executive director of the global environmental organization Greenpeace International. In his letter to schools, Naidoo recalled his experience being expelled at age 15 for organizing an anti-apartheid protest at his school in Durban, South Africa.

This setback redoubled my commitment to learning, and thankfully I was able to complete my studies and ultimately take up the role I have the honor of holding today. But I also had something that children of this generation do not have: the chance to imagine a future that is not overshadowed by the prospect of a climate emergency. My experience also informed my strong belief that children should not be punished for speaking out about the great injustices of our age. In fact, when it has fallen on young people to show the leadership that many adults who hold great positions of power have failed to, it is not young people's behavior we should be questioning. It is ours.

Naidoo returned to his home country this week to attend Financing the Future, a historic divest-invest summit in Cape Town that began Tuesday—which came after Amnesty's Global Assembly voted last month to divest from the dirty energy industry.

"Every person facing deeper levels of drought, stronger hurricanes, or conflict has been wronged by these fossil fuel companies," Naidoo said Monday. "Their rights to health, water, food, housing, and even life have been harmed, which is why Amnesty International has decided to divest from fossil fuel companies."

Like the climate strikes, the global divestment movement began with young people. A report released Monday by 350.org and DivestInvest detailing divestment commitments worldwide noted that "what began as a moral call to action by students is now a mainstream financial response to growing climate risk to portfolios, the people, and the planet."