... we became more than 10 billions?

Today for the section What if we  will speak of  the Earth and its population.
Some of you are thinking  << we are already too many ? >>  but how many people can the Earth even hold?
This is a big question for the scientists who are already looking for a solution but let’s watch this riddle more closely, now

we are over 7 billions and scientists believe in the end of the century our population will be over 10 billions but they are not sure how this situation would be sustainable because how are we going to feed all this people?
If we would put all the animal farms in a place we occupy a territory greater than the Africa and with the vegetables would be bigger than the South America and soon the soil would degrade and its fertility decrease. It wouldn’t be possible to grow anything. If these 3 additional billions would adopt the lifestyle similar to an American life,   Earth would finish before the end of 21st century. The only way to feed 10 billions people would be to switch to a vegetarian diet but this, would be impossible in a so short time-period?
Well, life on Earth would maybe be possible with 10 billions people but the quality of  life will be much lower.