Abstract
It is well known that the climatic conditions of our earth have changed since its origin. In its early days environmental conditions were not suitable for life. However, with due course of time it has changed and origin of life took place. Scientists have found seven cycles of glacial advance and retreat during the last 650,000 years and also that the last ice age abruptly ended about 7,000 years ago. The phenomenon of climate change has many implications and immense effects on our environment. There are many factors such as emissions of greenhouse gases, deforestation, urbanization and industrialization which impact the climate. Some of the major consequences of climate change include impacts on sea level rise in coastal areas, impacts on forestry, agriculture and food productivity, life and property in coastal areas, marine life, wildlife habitat and natural ecosystem, biodiversity, glaciers, floods and human health. This paper is an attempt to understand the phenomenon of climate change, historical evidences of climate change, identify reasons of global warming and climate change and its consequences in the South Asia and, in its neighbouring regions.
Highlights
The entire South Asian region is one of the most densely populated regions in the world with very diverse climatic conditions
It has been proximity to the coastal areas, the movements of the estimated that nearly 600 million South Asian population wind belts and temperature differences between land belong to a very low income group, that means even a and sea in the coastal areas
It has been estimated that the South Asia and Southeast Asian countries will be among the regions hardest hit by the consequences of climate change
Summary
The entire South Asian region is one of the most densely populated regions in the world with very diverse climatic conditions. There are certain organizations, pressure groups and individuals, small in number, are questioning the validity of such assertions and prefer to cast doubt on the occurrence of evidences on climate change Those who argue against the problems of climate change or global warming often claims that recent changes in climate can be mainly attributed to human activities and can be seen as a part of the natural variations in the Earth’s climate and temperature. The burning of fossil fuels, such as petroleum paleo-climate evidences reveals that current rate of oil and coal, which emits greenhouse gases into the global warming is occurring roughly ten times faster atmosphere, mainly carbon dioxide are considered as than the average rate of ice-age-recovery warming. It’s concentration in the atmosphere has reached to about 400 parts per million (ppm), a level never reached in more than 400,000 years in the Earth’s history and is the main cause of global warming. It has been observed that 11 of the 12 warmest years on record have occurred during the past 12 years
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