Environmental activists and politicians said Friday that U.S. President Donald Trump’s decision to abandon the 2015 Paris Climate Agreement was going to be “detrimental” for Africa, P.M. News reports.

“It will now be much harder to protect people on the African continent from the effects of climate change,” World Wide Fund for Nature South Africa researcher Jaco du Toit said. The withdrawal from the accord by the world’s second-biggest carbon polluter jeopardizes financing for mitigation and control efforts across the African continent, according to du Toit.

The former president of Ghana, John Mahama, who was instrumental in garnering support for the 2015 pact, said “Trump’s decision … comes from a truly misinformed position.” “The world becomes a truly unpredictable place when such global treaties can be reversed by the electoral decision of one nation,” Mahama warned.

Trump’s administration has “turned its back” on Africa, lamented Greenpeace Africa executive director Njeri Kabeberi. The African Union meanwhile promised to keep up its “strong commitment to full implementation of the Paris agreement,” in spite of the US’ withdrawal from the pact.