NUSA DUA, Indonesia (AFP) – UN environmental experts Thursday issued an urgent call to study the crucial role the oceans -- as massive carbon stores -- can play in the fight against global warming. The United Nations Environment Programme (UNEP) launched the "Blue Carbon" initiative together with the Indonesian government Thursday on the resort island of Bali. "A global scientific study of the role of marine and coastal ecosystems in meeting the climate change challenges is urgently needed in order to improve understanding," UNEP director Achim Steiner said on the sidelines of the gathering of climate experts and environment ministers....