What do CFCs stand for? Name some devices where CFCs are used. Why CFCs are considered as pollutants?

Arjun while travelling with his father saw the same message displayed at every traffic signal. The message was 'stop the vehicle engine at the red lights to save the fuel'. He noticed his father turning the engine off at each signal. He was confused to see this and asked his father
(a) It is recommended to stop the vehicle engine at the red light signals. Give reason.
(b) Suggest the process associated when vehicle engine is ON.
(c) What values are government trying to inculcate in people with the message?
(d) Will you support the message? Why?
(e) Mention the values shown by Arjun.

We should plant trees and nurture the ones already present in the neighbourhood. Why?

Read the paragraph and answer the questions following it.
Water is essential for life. Without water there would be no life. We usually take water as granted for its purity, but we must ensure the quality-of water. Pollution of water originates from human activities. Through different paths, pollution reaches to groundwater. Easily identified source or place of pollution is called as point source, e.g. municipal and industrial discharge pipes, where pollutants enter the water source. Non-point sources of pollution are those where a source of pollution cannot be easily identified, e.g. agricultural run-off, acid rain, etc.
(a) How do you classify the various sources of water pollution?
(b) What are the point sources of water pollution?
(c) Name any two non-point sources of water pollution?

An Indian holy river is among the ten most endangered rivers list of WWF. Which is it? How is the water of this river polluted?

It is said, "C0₂ contributes to global warming". Explain

Why is it advised that industries should switch over to cleaner fuels such as CNG and LPG in the TajMahal Zone in Agra ?

Explain traditional ways of purifying water to make it fit for drinking.

How does air get polluted? Explain.

What is water pollution? How is it caused?