Agence France-Presse: With its pleasure boats dipping on the horizon and clustered tourist restaurants, the Indonesian island of Nusa Lembongan looks little like the edge of a great wilderness. But according to scientists, this small and scrubby island off Bali is one corner of a huge marine ecosystem touted as the most diverse on earth — and a key environmental battleground for a planet grappling with climate change. The area is known as the Coral Triangle, and stretching across six nations …