There has been a huge increase in population around the world over the past 150 years. As for what brings about this, several elements are included. To begin with, as a consequence of the better sanitation, the risk of getting sick has decreased. What's more, poeple nowadays have learned a lot about sanitation and have practiced well to prevent possible diseases or flu. In addition, food plays an important role in people's daily life, and thanks to the improved farming methods that produce even more various and better food, they enable people to absorb more kinds of nutrients and provide people with strength and energy. Moreover, on feeling sick, people can go to the hospital for a health check as a result of advances in medicine and health care. The earlier the illness is discovered, the sooner people can receive appropriate cure or undergo an operation. Last but not the least, due to the improvement of public hygiene, advanced technology, as well as other factors, fewer infant die and more people live longer. To sum up, based on what are mentioned above, we can figure out how these causes lead to the increase in population.
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