Jump to navigation Jump to search
Earth is, at present, the only known habitable planet in the universe.
- Global warming is one of many significant threats to civilization.
- Gaia theory
- There are countless myths and a smaller number of theories explaining or describing the creation of the Earth and the universe.
- Young Earth theory gives the age of the Earth as being on a similar scale to that of human history, with the Earth being typically less than 10,000 years old.