Climate Change is a serious global environmental concern. The global increases in carbon dioxide concentration are due
primarily to fossil fuel use and land use change, while those of methane and nitrous oxide are primarily due to agriculture.
Global Warming is a specific example of the broader term ‘Climate Change’ and refers to the observed increase in the
average temperature of the atmosphere and oceans in recent decades. Its effect particularly on developing countries is
adverse as their capacity and resources to deal with the challenge is limited. Scientific studies have shown that the global
atmospheric concentrations of carbon dioxide, methane and nitrous oxide which are the most important Green House Gases,
have increased markedly as a result of human activities since 1750 and now far exceed pre-industrial values.
Climate change is impacting the natural ecosystems and is expected to have substantial adverse effects in India, mainly
on agriculture, water storage in the Himalayan glaciers which are the source of major rivers and ground water recharge,
sea-level rise, and threats to a long coastline and habitations. Climate change will also cause increased frequency of
extreme events such as floods, and droughts. These in turn will impact India’s food security problems and water security.
India over the past three decades have mastered the use of space technology. The operational satellites INSAT and IRS
have heralded an era of Space observations with high resolution observations of land, ocean and atmosphere. The IRS
satellites are providing observations of parameters such as land use/cover, forest, water bodies, crops etc. The satellite
data is operationally used for environmental studies and long term database on vegetation, soil condition, rainfall, ground
water etc. is being generated. Some of the unique studies are Biosphere Reserve Monitoring, Mapping of Glacial Lakes
& Water Bodies in Himalayas, Biodiversity Mapping, Early Warning of Drought and Severe Weather Events. The paper
presents details of the studies and salient results.