1. "The human population is now so large that the amount of resources needed to sustain it exceeds what is available." - David Attenborough
2. "The greatest threat to human existence may be our own inability to control our own numbers." - Stephen Hawking
3. "Population growth is straining the earth's resources to the breaking point." - Jacques Cousteau
4. "The population explosion is the primary force behind the degradation of our environment." - Prince Philip
5. "Exponential population growth and development place unprecedented stress on the environment." - Ban Ki - moon
6. "Population, when unchecked, increases in a geometrical ratio." - Thomas Malthus
7. "The future of humanity is at stake as population growth continues to rise." - Jane Goodall
8. "We must stabilise the population. This will be possible only if all nations recognise that it requires improved social and economic conditions and the adoption of a rational attitude towards population growth." - Lester R. Brown
9. "The power of population is indefinitely greater than the power in the earth to produce subsistence for man." - Thomas Malthus
10. "A finite world can support only a finite population; therefore, population growth must eventually equal zero." - Garrett Hardin
11. "Rapid population growth and technological innovation, combined with our lack of understanding of how the natural systems of which we are a part, can create a disconnect that becomes dangerous." - David Suzuki
12. "Population growth is the gravest issue the world faces if we continue at the present rate of population growth." - Jacques Cousteau
13. "Population growth is not respected for the balance of nature, and it needs a serious review." - Dalai Lama
14. "The key factor in population control is education." - Henrietta Fore
15. "Population growth must be balanced with the earth’s carrying capacity." - John Holdren
16. "All our environmental problems become easier to solve with fewer people and harder — and ultimately impossible — to solve with ever more people." - David Attenborough
17. "Instead of controlling the environment for the benefit of the population, perhaps it’s time we controlled the population to allow the survival of the environment." - David Attenborough
18. "We are in a bottleneck of overpopulation and wasteful consumption that could push half of earth’s species to extinction in this century." - E.O. Wilson
19. "The raging monster upon the land is population growth. In its presence, sustainability is but a fragile theoretical concept." - E.O. Wilson
20. "Population stabilisation should become a priority for sustainable development, including a strong focus on the empowerment of women and girls." - Kofi Annan