Maintaining life on earth<span />
<em>An ever-growing demand for resources by a growing population</em> is putting tremendous pressures on our planet's biodiversity and is threatening our future security, health and well-being, reveals the 2012 edition of WWF's Living Planet Report – the leading biennial survey of the Earth's health.
Answer:
walking to work or school
Explanation:
stops us from using cars which release gases that are is bad for the air quality
there are not any options