Which energy source does not release $CO_2$?

Read the following statements carefully and select the correct ones.
$I.$ $UV$ rays are essential for the production as well as degradation of ozone gas.
$II.$ Ozone present in the ionosphere acts as a shield absorbing $UV$ radiation coming from the sun.
$III.$ One-fourth of the incoming solar radiation is reflected by the atmospheric gases and clouds,and only half of the incoming solar radiation falls on the earth's surface,heating it. Of this,only a small portion is reflected back.

Select the incorrect statement$(s)$ from the following.

At the beginning of the twentieth century,forests covered about ....... of the land of India. By the end of the century,it shrunk to.......

Select the appropriate option regarding the natural aging of a lake.

Choose the correct option for the following sentences:
$(1)$ Reducing deforestation
$(2)$ Reducing the use of fossil fuels
$(3)$ Planting trees
$(4)$ Slowing down the growth of the human population.