Megacities are usually defined by a total population in excess of 10 million, with an additional component of population density. Rapid urbanization will take a heavy toll on the infrastructure of local governments, if city planners don’t incorporate ways to tackle air pollution.
A new report commissioned by 20 different governments states that more than 100 million people will die by 2030 if nothing is done to tackle climate change. Global economic growth will also be cut by 3.2% of gross domestic product (GDP).
In China, during the Chinese Great Leap Forward famine, the male to female birth ratios fell significantly. This implies that whenever food is in short supply, women are more likely to bear daughters than sons.