(a) To become more eco-friendly, I will suggested:

1. All the bulbs and tube-lights should be replaced with LED (Light Emitting Diode).
2. At home, everyone should use natural ventilation and light on day time.
3. We should use cloth bags instead of plastic bags for shopping.
4. We should avoid wastage of water. For example, waste water can be collected and use for mopping the floor. It can also be used for gardening purposes, etc.
5. For cooking food we should use PNG instead of microwave or oven.

(b)

1. On the switches of electrical appliances
2. when I was not in the room.
3. Open the water tap while brushing teeth.
4. Wasted petrol by keeping the engine of bike on at red light.