Post navigation Volcanism is thought to have been more influential in contributing to climates on Earth in the past than previously thought. Scientists have discovered evidence that suggests eruptions of global volcanism occurred approximately 1 million years ago, and from those eruptions, increased amounts of methane in the atmosphere resulting in warmer temperatures. This suggests that volcanism played a larger role in climate changes over the period of a million years than previously assumed. Each year, thousands of asteroids enter Earth’s vicinity, and most of them pass by without incident. While an asteroid passing too close to Earth could have catastrophic consequences, such an event is extremely rare. NASA and other space agencies track space objects in order to ensure they do not pose a threat.