Which resources would be limited in the human population?

Water is by far the most scarce resource in an arid region. In the modern era, this mostly affects developing nations because in wealthier nations, water is simply transported to arid regions, which is how places like Las Vegas can exist.

Although it may not seem like a resource, space can be a major problem. In cities such as New York and many in Europe, the growing population must be accommodated in a very small area, requiring careful land division. On the other hand, there are many locations in the world where space is not a problem for a population.

In many parts of Africa, for example, people still burn wood for fuel; this may have worked for a city of 1,000, but as that number rises to the millions, their forest quickly disappears. Energy is another major issue for some areas, especially some developing countries where their population is growing rapidly. Often, limits are placed on energy usage simply because power plants can't produce enough to power a large city.

Resources that would be limited in the human population include:

1. Fresh water
2. Fossil fuels
3. Arable land for agriculture
4. Minerals and metals
5. Forests and biodiversity
6. Fish stocks
7. Clean air