3 . It is undoubted that recycling is a very effective way to save energy

4 . An amount of energy comsumption has kept increasing over last few decades because of sharp increase of world population

5 . It is alarming that many people in undeveloped countries die everyday because of starvation

3. It/ be/ undoubted/ recycle/ be/ a/ very effective way/ save/ energy.

`→` It is undoubted that recycling is a very effective way to save energy.

4. Amount/ energy consumption/ keep/ increase/ over/ last/ few decades/ because/ sharp increase/ world population.

`→` An amount of energy comsumption has kept increasing over last few decades because of sharp increase of world population.

5. It/ be/ alarming/ many/ people/ undeveloped countries/ be/ die/ everyday/ because/ starvation.

`→` It is alarming that many people in undeveloped countries die everyday because of starvation.

`text{#Icebibi}`

`text{#Try hard together}`