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.
These findings were published online recently in Environmental Research Letter .
Whether these findings would have major implications for land-use decision making in the Indian backdrop of the proposed Land acquisition Bill remains to be seen. “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 told PTI.
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 “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. — PTI