A proposal by wealthy nations to mobilise $8.5-billion for South Africa to help reduce its dependence on coal has proved more complex than anticipated, which has stalled its implementation. The money was offered to South Africa at United Nations climate talks in Glasgow last year under a deal that was seen as a possible blueprint for helping other coal-reliant developing countries transition to using cleaner energy. Details of the types of financing that will be made available and the terms and conditions attached to it are still being hashed out, along with South Africa’s investment plans, said Barbara Creecy, the nation’s environment minister.