By Surya Parkash
The author is Associate Professor, Head of the Knowledge Management and Communication Division and Leader, World Centre of Excellence on Landslide Risk Reduction (ICL and IPL-ISDR). email@example.com
The Chennai floods in November-December 2015 are a wake-up call for us all. It is high time we stopped all unregulated unauthorised illegal encroachments and constructions over natural watercourses, creeks, estuaries, ponds, lakes and marshlands in our greed to over-exploit our natural resources under the ruse of development.
Climatic conditions and processes change over space and time. Nearly 70 per cent of the earth’s surface is covered by oceans. Both land and oceans have different characteristics in terms of their heating and cooling capacities, resulting in differences in atmospheric pressure, temperature and relative humidity. In addition to the massive ice-sheets over the Arctic and the Antarctic, the warm and cold oceanic currents are also responsible for moderating the climate in different latitudes, as also the El Niño Southern...