In 100 years there will be lack land for living for whole 15b of our population... not enough food for everybody... due to global warming we will have much more deserts and drinking water will cost more than gold...
How the planet is going to sustain a human population of 15 billion? And more worryingly, 50% of this population will be in the continent of Africa. The African population is going to rise by 7X during the next 100 years. There is not enough land available there for all these people.