1. what form do fossil fuels take? what are some of the current uses of fossil fuels?
2. what are the positive aspects of using fossil fuels? why do we use them so much?
3. what are some of the negative aspects of using fossil fuels? how do they affect the environment?
4. how can new technology with some of the negative sides of fossil fuels? where are we heading in the future in regard to fossil fuels?

1.  coal, oil and natural gas. they are used for energy provision

2. Fossil fuels shift our power supplies to renewable energy sources

3.Transporting fuels from the mine or well can cause air pollution and lead to serious accidents and spills. When the fuels are burned, they emit toxins and global warming emissions.

4. New technology is being developed to help stop the fossil fuels realsing toxins into the air and causing air pollution.

"d.) carbon dioxide and hydrogen sulfide"

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link: