Global warming is the temperature of Earth 's surface, oceans and atmosphere going up over tens to thousands of years. Sea level is rising for two reasons. One reason is because of ice on the land, like Greenland , melting into the sea. The other reason is because of water getting bigger when it gets warmer. Many cities will be partly flooded by the ocean in the 21st century. Global warming is mostly because of people burning things, like gasoline to make cars go and natural gas to keep houses warm.
The concept of climate change has been around for quite a while. The earliest mention of climate change dates back to the 19th century. Swedish scientist, Svante Archenius was the first scientist to study the effect of CO2 on climate. Climate change is one of the most important challenges of humankind in this century. The ability to adapt, mitigate and reduce carbon emissions will be decisive to preserve the world for future generations.
The scientists used the best available evidence and supplemented it with advanced computer simulations to arrive at likely impacts on agriculture, water resources, cities and coastal ecosystems in South Asia, South East Asia and Sub-Saharan Africa. Some of their findings for India include:. India is already experiencing a warming climate.
Climate change is increasing extreme weather patterns. An example of this is hurricane Katrina in Almost a quarter of the species present on land today might disappear by the year
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