The World Population Day, celebrated every July 11 since 1989, was established precisely for that purpose, during the July 11, 1987 the world population reached five billion people. That same year 1987, the World Commission on Environment and Development (WCED) warned, in Our Common Future, the consequences of rapid population growth: "In many parts of the world population grows as environmental resource fees available can not support, rates are exceeding all reasonable expectations for improvements in housing, medical care, food security or energy supply. "
