Question

state the ways of reducing the presence of greenhouse gases

Answer 1

We should use public transport instead of our own vehicles.
We should plant more and more trees so that it can reduce the greenhouse gases.

Answer 2

(1) use public transport for travelling. this will reduce the amount of vehicles on the road.
(2) plant more and more trees to increase the oxygen level in the atmosphere.
(3) CFCs are the main cause of green house gases.. therefore the use of CFCs in refrigerator, air conditioners,etc should be minimised