Vocabulary:
• Fossil fuel
Fuels, such as gas, coal, and oil, that were formed underground from plant and animal remains millions of years ago.
• Turn upside down
To (cause something to) change completely.
• Shape
The particular physical form or appearance of something.
• Convenient
Suitable for your purposes and needs and causing the least difficulty.
• Dependable
If someone or something is dependable, you can rely on him, her, or it.
• Discard
To throw away or get rid of something because you no longer want it.
Source: BBC News