The correct option is E Human overpopulation
The world's most serious ecological problem is the overpopulation of human beings. The over population of human beings has led to the continuous destruction of the rain forests by the land developers, ranchers, plantation owners. Many rainforests in Central and South America have been burnt down to make way for cattle farming, Further, overfishing of the oceans to satisfy the needs of the human population and burning of fossil fuels not only leads to depletion of the natural resources but also results in global warming.