EXCLUSIVE: Ahead of Cannes, Entertainment One’s boutique label Seville International has boarded international rights to United Nations-backed climate change and music documentary Great Green Wall, which is fronted by Malian singer and model Inna Modja (pictured) and executive-produced by City Of God and The Constant Gardener director Fernando Meirelles. Currently in production, Great Green Wall focuses on the ongoing Africa-led project to grow an 8,000km wall of trees…