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FILE - Filao trees form a curtain that protects the beginning of the Great Green Wall, planted to slow coastal erosion along the Atlantic Ocean, in Lompoul village near Kebemer, Senegal, Nov. 5, 2021. A series of complex challenges, including a lack of funding and political will as well as rising insecurity linked to extremist groups al-Qaida and the Islamic State in Burkina Faso, are obstructing progress on Africa's Great Green Wall, according to experts involved in the initiative. (AP Photo/Leo Correa, File)

FILE - Filao trees form a curtain that protects the beginning of the Great Green Wall, planted to slow coastal erosion along the Atlantic Ocean, in Lompoul village near Kebemer, Senegal, Nov. 5, 2021. A series of complex challenges, including a lack of funding and political will as well as rising insecurity linked to extremist groups al-Qaida and the Islamic State in Burkina Faso, are obstructing progress on Africa's Great Green Wall, according to experts involved in the initiative. (AP Photo/Leo Correa, File)

FILE - A girl carries a bucket of water from a community well in the village of Ndiawagne Fall, on one end of a project called "Great Green Wall" that was envisioned as a way for Africa to fight climate change, in Kebemer, Senegal, Nov. 5, 2021. A series of complex challenges, including a lack of funding and political will as well as rising insecurity linked to extremist groups al-Qaida and the Islamic State in Burkina Faso, are obstructing progress on Africa's Great Green Wall, according to experts involved in the initiative. (AP Photo/Leo Correa, File)

FILE - A girl carries a bucket of water from a community well in the village of Ndiawagne Fall, on one end of a project called "Great Green Wall" that was envisioned as a way for Africa to fight climate change, in Kebemer, Senegal, Nov. 5, 2021. A series of complex challenges, including a lack of funding and political will as well as rising insecurity linked to extremist groups al-Qaida and the Islamic State in Burkina Faso, are obstructing progress on Africa's Great Green Wall, according to experts involved in the initiative. (AP Photo/Leo Correa, File)

FILE - A desolate, semi-arid landscape surrounds the Sahel village of Ndiawagne Fall, on one end of a project called "Great Green Wall" that was envisioned as a way for Africa to fight climate change, in Kebemer, Senegal, Nov. 5, 2021. A series of complex challenges, including a lack of funding and political will as well as rising insecurity linked to extremist groups al-Qaida and the Islamic State in Burkina Faso, are obstructing progress on Africa's Great Green Wall, according to experts involved in the initiative. (AP Photo/Leo Correa, File)

FILE - A desolate, semi-arid landscape surrounds the Sahel village of Ndiawagne Fall, on one end of a project called "Great Green Wall" that was envisioned as a way for Africa to fight climate change, in Kebemer, Senegal, Nov. 5, 2021. A series of complex challenges, including a lack of funding and political will as well as rising insecurity linked to extremist groups al-Qaida and the Islamic State in Burkina Faso, are obstructing progress on Africa's Great Green Wall, according to experts involved in the initiative. (AP Photo/Leo Correa, File)

FILE - Women walk under filao trees planted to slow coastal erosion as they form a curtain that protects the beginning of the Great Green Wall, a project that began in 2007 along the Atlantic Ocean, in Lompoul village near Kebemer, Senegal, Nov. 5, 2021. A series of complex challenges, including a lack of funding and political will as well as rising insecurity linked to extremist groups al-Qaida and the Islamic State in Burkina Faso, are obstructing progress on Africa's Great Green Wall, according to experts involved in the initiative. (AP Photo/Leo Correa, File)

FILE - Women walk under filao trees planted to slow coastal erosion as they form a curtain that protects the beginning of the Great Green Wall, a project that began in 2007 along the Atlantic Ocean, in Lompoul village near Kebemer, Senegal, Nov. 5, 2021. A series of complex challenges, including a lack of funding and political will as well as rising insecurity linked to extremist groups al-Qaida and the Islamic State in Burkina Faso, are obstructing progress on Africa's Great Green Wall, according to experts involved in the initiative. (AP Photo/Leo Correa, File)