Nearly 50% of terrigenous materials delivered to the world's oceans are delivered through just twenty-one major river systems. These river-dominated coastal margins (including estuarine and shelf ecosystems) are thus important both to the regional enhancement of productivity and to the global flux of C that is observed in land-margin ecosystems. The tropical regions of the biosphere are the most biogeochemically active coastal regions and represent potentially important sinks of C in the biosphere.

FOLLOWING two deaths and a series of misreported facts, the National Environment Appellate Authority (NEAA) cancelled the environment ministry’s clearance to a thermal power plant in Sompeta in coastal Srikakulam district of Andhra Pradesh.