There is great interest in the topic of how long humanity will be able to exist on the Earth. For many years people have contemplated the apocalyptic visions of the world, with ancient civilizations such as the Mayans attempting to estimate when it would be. Nowadays however, science provides a more reasonable approach. Renowned astrophysicist Stephen Hawking and other Nasa affiliated scientists have studied such chances and risks, mentioning climate change and resource scarcity as two important ones.