Causes

The culprit is the internal combustion engine.

Societies must reassess their relationship with the internal combustion engine.

There are about 1 billion motor vehicles in the world (2016).

The current world's population is 7,324,000,000 on May 2016.

What would happen when half of the population of the world uses motor vehicles (cars)?

Effects

If half of the world's population uses cars, the concentration of carbon dioxide in the atmosphere may reach 900 ppm.

The mean ocean level will increase about 1 m.

Mean air temperatures will increase about 5 to 10 ^oC.

The world's climates and ecosystems will change [geographical shift].

Solution

The solution is to research and develop renewable sources of energy.

Solar energy is the best renewable source of energy.

Wind power is also feasible in certain cases.