What problems does a rapidly increasing population cause for a country?

What problems does a rapidly increasing population cause for a country?
One problem is how much land we have that we can grow food on. Only 1/32 of our land we can grow food on. There for our food amount is rappidly decreasing. Since, we can't grow food most places we won't have enough food if our population keeps increasing. Also, the amount of land people are able to live on is only 1/8. We already are living on most of that land. If our population keeps increasing we will practically be living on each other's feet!