Choose the correct answer.

Pollution will reach to ______ levels in the future if we don't develop cleaner power sources to replace instead.

Choose the correct answer.

The mining project threatens one of the world's richest areas of __________.

Choose the correct answer.

In addition, more ______ zones for walking and cycle paths will be made available for people in all neighbourhoods.

Choose the correct answer.

Visitors can wander around here without difficulty because most of the antique area is now a pedestrian __________.

Choose the correct answer.

The holiday cottage has many green touches, including __________ cleaning products.

Choose the correct answer.

The Saudi government is investing billions in __________ to support the enormous influx of people in Mecca.

Choose the correct answer.

Many researchers claim that yoga practice and physical activities can improve people's ______ of life.

Choose the correct answer.

We must improve the environment through __________ design and greener buildings.