It was said, according to Zhou Enlai, that the main effect of President Nixon's visit to China as he strengthens the ties between the United States and China, was that "it <span>bridged the vast ocean in the world, twenty-five years of no communication." The ties between China and US at that time are unfriendly since China was an ally of the Soviet Union at the course of the Cold War.</span>
Energy shortage, lack of fresh, clean water, and lack of monetary resources are overpopulation issues.
Over the last half century the population of the world has exploded, and it is also the culprit of the environmental challenges facing the planet today.
Overpopulation refers to the phenomenom in which the number of existing human population exceeds the carrying capacity of Earth.
Reduced mortality rate, better medical facilities, depletion of precious resources are few of factors that may result in overpopulation.
