HI HARSHIT,
GLOBAL WARMING IS CAUSED MAINLY DUE TO CARBON DIOXIDE WHICH IS A GREENHOUSE GAS SO IF TREES ARE THERE THEY WOULD ABSORB CARBON DIOXIDE WHICH WILL REDUCE GLOBAL WARMING. BUT DEFORESTATION IS DECREASES THE AMOUNT OF TREES SO IF TREES ARE NOT THERE TO ABSORB CARBON DIOXIDE GLOBAL WARMING WILL INCREASE
THANKS
MRIDULA