Human beings are highly responsible for (a) ______ change. They are (b) ______ the environment by (c) _____ greenhouse gases such as carbon dioxide, methane, CFC etc. Combustion of coal, burning of (d) _____ fuels, doforestation are the (e) ______ causes of pollution.

(a) control (b) reason (c) accumulated (d) burnt (e) purposes

It is true that most of the natural phenomena are beyond humans' control, yet he can (a) control some aspects like the greenhouse effect by his wise activities. Carbon dioxide is the main (b) reason of it. Carbon dioxide is being (c) accumulated in the atmosphere by the burning of fossil fuels. In fact, industrial activities have given rise to many factories where coal is (d) burnt for energy. Moreover, mineral oil and natural gas are also used for various (e) purposes .

(a) increasing (b) producing (c) meet (d) afforestation (e) stake

So, it is our duty to stop cutting down trees indiscriminately. We should also inspire the general mass to plant more and more trees for our existence on earth. There are several reasons why the carbon dioxide concentration has been (a) increasing in the atmosphore. Our mills and factories burn coal, mineral oil. natural gas etc. with a view to (b) producing energy. We also burn these materials to (c) meet our everyday needs. But for our own safety, we have to encourage (d) afforestation . Otherwise our existence on earth will be at (e) stake .