1.   A layer of gases, including those which are known as the greenhouse gases, surrounds the Earth.

2.   Agriculture, deforestation and the other secondary sources of greenhouse gases are critical to many.

3.   All these gases are potent greenhouse gases.

4.   But it might contribute to global warming because methane is a powerful greenhouse gas.

5.   But water vapour is also a greenhouse gas.

6.   Carbon dioxide is a so-called greenhouse gas, which absorbs energy from the sun, making the air warmer.

7.   Carbon monoxide is also a powerful greenhouse gas.

8.   Climate change through the man-made modification of greenhouse gases might be disastrous, but it might equally be deliverance.

9.   Greenhouse gases are produced by a large range of natural and man-made processes throughout the woAd.