Nature and EnvironmentAfricaTime for action on Africa's Great Green Wall03:43This browser does not support the video element.Nature and EnvironmentAfrica06/16/2021June 16, 2021Haidar el Ali, the man behind Senegal's part of the Great Green Wall, says it's time to get the ecological project back on track. Currently, the initiative to plant trees across 11 African countries is 10 years behind.Copy linkAdvertisement