The correct answers are:
<em>- habitat destruction;</em>
The fossils fuels are devastating towards the habitat, and at the places where they are extracted, or at the places where they are manufactured, or there's some accidents with them, they cause a very big long term damage to the habitat.
<em>- air pollution;</em>
Through the combustion of the fossils fuels, lots of gases go into the atmosphere, change its composition, and pollute it.
<em>- add to greenhouse effect;</em>
From the fossil fuel combustion (mainly from oil) and leaking (from natural gas), the emissions of carbon dioxide and methane are significantly increased in the atmosphere, and they are the two gases that contribute the most to the Greenhouse effect.
<em>- water pollution;</em>
It is common for the fossil fuels to end up in the water bodies, be it in small amounts though the garbage, or by some disastrous leaking, and whichever way it is, it is totally destroying the water for a long period of time.