The contemporary trend of global warming is aptly highlighted in the IPCC report 2007. There is a strong consensus amongst scientists and planners today that the earth's climate is entering a warm episode, nudged primarily by human activities of fossil fuel burning and land use changes that inject steadily increasing amounts of CO2 into the atmosphere. It is also quite possible that the increased concentrations of atmospheric CO2 will also have a direct influence on productive systems of plant species in view of increasing rates of photosynthesis and improved water use efficiency.

Poor management of irrigation water and inadequate drainage system in plains have made vast tracts of agricultural land unproductive due to waterlogging and high moisture content. Integrated development of such waterlogged ecosystem has been taken up under NWDPRA (National Watershed Develpoment Project for Rainfed Areas) with the twin objectives of sustainable production of food, fruit, fuel and bio-mass and restoration of ecological balances with the watershed.

Joseph Wright and Helene Muller-Landau suggest that regeneration of tropical forests might lead to far less species loss than is feared by most tropical biologists (12 May, p 42). There is currently very little reason to think so.

Home-garden-system is an ecosystem of different kind and a common feature of most suburban landscape in many rice farming tropical countries. If these kinds of ecosystems are well maintained, well-developed and used most sustainably; they can contribute a lot to the conservation of biological diversity by lessening the destructive use of the few nature reserves and forest ecosystems remaining.

Freshwater basins are vulnerable to human-induced change for a number of reasons. The change detection study of Ansupa lake, Orissa was carried out by using multi-temporal satellite data clearly indicates the decrease in wetland area. Due to high anthropogenic pressure, the wetland is shrinking day-by-day.

Vindhyan region is very rich in plant biodiversity because of its variety of geology, land shapes like plateau, plane, valley and hill areas. There are variety of climate and altitudinal variations compiled with varied ecological habitants.