Rainwater harvesting helps to :
(i) Overcome the rapid depletion of ground water levels
(ii) Meet the increase demand of water.
(ill) Reduces flood and soil erosion.
(iv) Water stored in ground is not contaminated by human and animal wastes and hence can be used for drinking purpose.

(i) Hydropower plants converts the kinetic energy of flowing water into electricity.
(ii) Electricity produced by hydropower plants is called hydroelectricity.

(i) It is used as fuel for cooking
(ii) It is used to run motors and pump sets
(iii) It is used to generate electricity

(i) By using energy efficiently.
(ii) Avoid wastage of water.
(iii) Avoid use of plastics and other non biodegradable materials

It refers to afforestation programmes which includes planting and protecting trees with multiple uses and helps in restoration of green cover.

Electronic wastes are generated from the spoiled, outdated, non - repairable electrical and electronic devices such as computers, calculator, toys etc.

i) Non-renewable energy.
ii) Formation of these fuels is a very slow process and takes very long period of time for renewal.

If the habitat of wild animals is disturbed it affects the biological diversity and revenue through tourism.

a) Solar cookers help to cook food.
b) For drying clothes and grains.

(i) Yes. the decomposition of bio-degradable substances may release certain gases into the atmosphere.
(ii) Insects like mosquitoes and flies may breed in composting areas and may cause diseases.
(iii) Their impact is less as compared to the accumulation of non biodegradable substances.