Answer:
3) Saudi Arabia will soon have to begin fracking, leading to protests and further destabilization.
Explanation:
Peak oil theory, propounded by a geophysicist named Marion King Hubert, describes that, conventional sources of crude has either reached or will soon reach their maximum production capacity globally, thus, there will be downward slope; a bell curve shape, in the production capacity by the mid of 21st century.
Hence, the most critical aspect of Peak Oil theory, is that, the world’s oil-based economy, such as Saudi Arabia, will face a critical moments towards the mid of the 21st century, when their production capacity is going down, that is, having a bell curve shape, leading to a form of changes in extraction methods, such as fracking, thereby, leading to protests by the citizens of these areas, and further destabilization of the nations involved, due to negative effects of fracking methods of oil extraction on the air and water quality of the area.
A long drought is what I believe the answer is
There are several reasons experts believe the city of Cahokia disappeared such as:
- It grew too large
- Sanitary system wasn't good and people got sick.
- Inhabitants destroyed the nearby forests to get firewood and without the wood, their city couldn't survive.
- Enemies attacked.
Cahokia was a thriving city that was quite prosperous with their main food being maize which the fair climate allowed them to grow.
Overtime this changed and a drought that lasted for centuries kicked in. It led to conflict and strife in the large settlement as people could not get enough food.
Experts also believe that other problems such as poor sanitation systems and enemies attacking may have also contributed to the inhabitants leaving.
In conclusion, Cahokia was large and thriving but faced many challenges that in the end led to it collapsing.
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