What is the main idea of this passage? A In order to help predve 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 decrease the use of electricity 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

The main idea of this passage is that there are various ways for builders to construct more environmentally friendly buildings, such as using passive solar heating, reducing fresh water consumption, and implementing green roofs and walls to reduce energy costs.