Why does deforestation alter local climate and rainfall patterns?

Why does deforestation alter local climate and rainfall patterns?

• A. Increased evapotranspiration and rainfall
• B. No effect on climate
• C. It always causes desertification within days
• D. Reduced evapotranspiration and altered albedo can reduce rainfall

Answer: (D)

Deforestation changes the local climate mainly by reducing the amount of moisture added to the air and by altering the surface’s energy balance. Trees release a lot of water vapor through evapotranspiration (transpiration plus evaporation). When forests are cleared, this moisture input drops, so the atmosphere near the ground becomes drier and the convection processes that drive rain weaken, leading to less rainfall in the area.

At the same time, removing vegetation changes the surface’s reflectivity and how it absorbs heat. This altered albedo and energy balance can modify surface temperatures and atmospheric stability, which in turn affects how air masses rise and where moisture converges. Taken together, reduced evapotranspiration and the changed energy dynamics tend to reduce local rainfall.

That’s why the statement about reduced evapotranspiration and altered albedo leading to less rainfall best fits how deforestation influences climate locally. The other options either imply more rain, no effect, or an extreme, rapid desertification, which doesn’t capture the typical processes involved.