(i) The objective of this kind of energy is to replace the use of fossil fuels which are mainly made of hydrocarbons and hence result in pollution.
(ii) Renewable source of energy do not result in pollution and we can reuse them.
(iii) We all need to shift to these resource of energy and try to avoid usage of fossil fuels.

(i) Management of forest and wild life resource is considered as a challenging task.
(ii) Now-a-days people are continuously cutting down trees and it causes deforestation and it results in lack of oxygen.
(iii) People kill animals for making cloth designs and thus harm wildlife.

i) The top layers of soil contain humus and mineral salts, which are vital for the growth of plants.
ii) Removal of upper layer of soil by wind and water is called soil erosion.
iii) Soil erosion causes a significant loss of humus, nutrients and decrease the fertility of soil.
iv) The direct and primary effect of soil erosion is soil loss and nutrient leaching resulting in reduction of land productivity.
v) Annual floods causes damages to crops, property and lives.
vi) Deforested rain forest soil becomes dry and nutrient-deficient as there is no longer vegetation to hold water and nutrients in place.
vii) Heavy rains further erode soil and saturate waterways with excess nutrients, disrupting the food chains of tropical ecosystems.
viii) Eroded sediments can even change the course of rivers, which suffer from huge deposits of silt from deforestation.
ix) Desertification is another possible consequence of erosion.

a) Forests are an important component of our environment.
b) Forest is dominated by
i) microorganisms
ii) flowering plants
iii) shrubs
iv) climbers
v) dense trees
vi) provide a vast habitat for wild animals.
a) Forests also contribute to the economic development of our country.
b) Forests are vital for human life.
c) It is a source for a wide range of renewable natural resource.
d) They provide wood, food, fodder, fibre and medicine.
e) Forest are major factor of environment concern like.
i) carbon sink
ii) regular climatic conditions
iii) increase rainfall
iv) reduce global warming
v) prevent natural hazards like food and landslides
vi) protect wildlife
vii) act as catchments for water conservation.
f) They also play a vital role in maintaining the ecological balance.

Prevent soil erosion:
(i) Retain vegetation cover, so that soil is not exposed.
(ii) Cattle grazing should be controlled.
(iii) Crop rotation and soil management improve soil organic matter.
(iv) Runoff water should be stored in the catchment.
(v) Reforestation, terracing and contour ploughing.
(vi) Wind speed can be controlled by planting trees in form of a shelter belt.