What is the main idea of this passage?
A) In order to help preserve and protect our environment, builders should construct more "green" buildings.
B) One way a building can be more green is by the use of passive solar heating to decrese the use of electricity.
C) Reducing the amount of fresh water used in building is another way that builders can help protect the environment.
D) One way a building could be more green is through the use of green roofs and walls to reduce heating and cooling costs.

In order to help preserve and protect our environment, builders should construct more "green" buildings.

Option A.

Explanation:

Because of the various activities of the human beings, for their own growth and development, the human beings have caused great harm and damage to the environment.

This has led to disasters because of the damage that the environment can not control. It is the need of the hour that the human beings should make efforts to save the planet. One of the ways for this is doing activities that do not harm the environment, making the businesses greener.