Cause and Effect 2-1 World Population Growth

Currently the population of Earth is about 7,88 billion people. The Earth may be able to support 9 billion people.

The population of the world increased gradually in the last 200 years and it speeded up during the last century.

Renewable natural sources can be replenished at a higher rate than they are consumed. These are: solar, wind, hydro, tidal, geothermical, biomass energy.

It is threatened by the growing population. The average person today puts about 1.1 metric tons of carbon into the atmosphere each year.

Raw materials found in the nature, such as crude oil, natural gas, stones, minerals, forest, land, animal, water resources.

On the Earth more than 97 % of the water is salt water. Three quaters  (2,25%) of the remaining 3% of fresh water is frozen at the North and South Poles.

Since the 1950s the Vietnamese population almost quadrupled. 70 years ago it was nearly 25 million and it will reach soon 100 million.

Commercial sources are coal, petroleum and electricity as they are bought and sold. 

FREE ANSWER

More than 97% of the water on Earth is salt water. Only 3% of the water on Earth is fresh water.

Nonrenewable natural sources sources that will run out or will not be replenished in our lifetimes. These are: coal, natural gas, oil and nuclear energy.

Overcultivation has already damaged an amount of farmland equal to the size of the United States and Canada combined.

Most of it comes from the burning fossil fuels - oil, gasoline, coal, wood and natural gas.

As the population of the world increases and the standard of living goes up in other countries, so will the demand for energy.

It's the removal of salt from salt water. It's not a solution to the shortage of fresh water because it takes a lot of energy and it's very expensive.s