Population questions

Brazil's current population shows a fast growth. The number of babies greatly surpasses the number of elders. This fast growth is not good for a country. In the next 15-20 years, Brazil's population will probably still be able to be sustained by the environment, but it will become overly crowded. With that, consequences such as unbearable traffic jams and huge lines in public places will become routine. This may already be observed in cities like São Paulo and Rio. If the population continues growing like this, cities like Brasília, Curitiba, Florianópolis and etc will become just like these two. With that, violence increases and everything becomes harder. As time goes by, the environment will no longer be able to sustain so many people, reaching maximum capacity. If the population growth continues like this, within the next 50 years, Brazil will probably have met its carrying capacity, so the population will now begin to decrease. Because the resources will be scarce, the "survival of the fittest" will begin. The people who can afford, or who have access to health, education and basic needs will live, the people who do not, will begin to die. Eventually, the population will become steady again.
This fast growth might help the economy in the beginning, because since there will be more options, businesses will be able to choose from a wider range, allowing them to pick the best of the best people. But, as population continues to grow, there will not be enough jobs for everybody, increasing unemployment rate, poverty, diseases, resources become harder to get, a lot of energy and water is required to sustain the country, among others. With this energy and water, we will increase pollution, and for those who believe, worsen global warming. More forests will be cut down, species will become extinct, water will become scarce, housing will be hard to find. Hopefully, population growth will stop before Brazil reaches this point, because as a developing nation, we cannot afford to undergo such drastic changes all at once.