Mumbai: According to scientists, evaporated water helps in cooling earth as a whole, not just the local area of evaporation, a study said.

A new study by scientists at the Indian Institute of Science, the Carnegie Institution for Science at Stanford University and Lawrence Berkeley National Laboratory have demonstrated that evaporation of water from trees and irrigated crop areas could cool the planet which could have major implications on decision making for land use.

These findings were published online on September 14 in Environmental Research Letter.

"In the Indian backdrop of proposed Land acquisition Bill, the findings could have major implications for land-use decision making," he said.

"It is well known that clearing of forests for agriculture and infrastructure development can contribute to local warming by decreasing local evaporative cooling, but it was not understood whether this decreased evaporation would also contribute to global warming," Govindasamy  Bala of the Centre for Atmospheric and Oceanic Sciences, IISc Bangalore said.

Globally, this cycle of evaporation and condensation moves energy around, but cannot create or destroy energy. How could then evapotranspiration change global climate if the net heating is zero?

According to Bala "it is the feedback loops in the climate system. In this case, it is primarily the cloud feedback. Enhanced surface evaporation causes an increase in the amount of low level clouds in the atmosphere. These clouds scatter more solar radiation back to space and cool the planet," he said.

"The policy implications of this study are enormous. The recent Food and Agriculture Organisation estimate showed that around 13 Million hectares of forests are converted to other uses or lost each year.

(Agencies)