Which one of the following statements is not true for hydropower generated from river dams?
(1) Dams encourage sustainable growth.
(2) It does not pollute water or air.
(3) Hydropower facilities can have large environmental impacts.
(4) Dams displace indigenous people from their river lifelines.

Which of the following is/are greenhouse gas/gases?

Correct Answer: All of the above

Step-by-Step Explanation:

To determine which of the listed substances are greenhouse gases, let us examine each option provided:

1. Carbon dioxide (CO₂): Carbon dioxide is one of the primary greenhouse gases present in Earth's atmosphere. It traps heat radiation emitted from the Earth's surface, contributing significantly to the greenhouse effect.

2. Methane (CH₄): Methane is a potent greenhouse gas produced through natural processes as well as human activities, such as agriculture, livestock digestive processes, and fossil fuel production.

3. Water vapour (H₂O): Water vapour is actually the most abundant greenhouse gas in the Earth's atmosphere. It plays a major role in trapping infrared radiation and controlling atmospheric temperature through a natural feedback loop.

Since carbon dioxide, methane, and water vapour are all recognized greenhouse gases, the correct option encompasses all of them.

Therefore, the correct answer is All of the above.