Earth's climate was relatively stable for a long period of time. For three billion years, temperatures were mostly warm and...
Cycle
Earth bears many signs of human influence, from warming that exceeds pre-industrial temperatures to a rising sea. Add to that...
Geologic activity on Earth appears to follow a 27.5-million-year cycle, giving the planet a "pulse," according to a new study...
For many years, the vicious cycle has spun: Websites solicit lurid, unverified complaints about supposed cheaters, sexual predators, deadbeats and...