A paragraph "the impact of overpopulation on our planet". Could you correct it?

Our planet experiences a dramatic increase in population. It is becoming a grave problem today, especially for developing countries. The population is growing extremely fast, so it's becoming difficult for [a/the] government to provide enough food for all people. Therefore, the population of poorest countries often suffers from starvation or lack of clean water. In addition, countries are facing with another serious problem like unemployment and poverty. Combined, these factors could lead to a high crime rate. Overpopulation also affects the environment. For example, a high number of cars in big cities causes not only terrible traffic jams but also the air pollution.