A field study was conducted at the Alanthurai watershed in order to estimate the soil erosion status using GIS and USLE. The annual soil loss values estimated from the USLE is represented pictorially using Arc view 3.2a version of GIS software.

Wetlands ecosystems are a natural source of local, regional and global significance. Historically their high level of plant and animal (especially bird) diversity is perhaps the major reason why wetland protection has become a high priority worldwide, supported by international agreements, such as Ramsar Convention and the International Convention of Biological Diversity.

When American and Chinese scientists agreed to measure pollution and dust over China, nobody foresaw how difficult it would be.

Many of the world's largest deltas are densely populated and heavily farmed. Yet many of their inhabitants are becoming increasingly vulnerable to flooding and conversions of their land to open ocean.

Feedbacks on climate change so far identified are predominantly positive, enhancing the rate of change. Loss of sea-ice, increase in desert areas, water vapour increase, loss of tropical rain forest and the restriction of significant areas of marine productivity to higher latitude (thus smaller geographical zones) all lead to an enhancement of the rate of change.