Ancient heat wave?
About 55 million years ago, an intense heat wave hit the planet. Earth's surface temperature surged by 9 degrees Fahrenheit (5 degrees Celsius). Then, after a relatively short time, the heat subsided, only to be followed by at least two similar, but smaller heat waves.
Based on chemical clues preserved in rocks, scientists believe a surge of carbon dioxide warmed the planet. But where did all of this greenhouse gas come from?
A team of scientists is proposing that it came from the melting of permafrost, frozen soil packed with organic matter, after cycles in the Earth's orbit warmed up the areas near the poles. The melting released a massive amount of carbon into the atmosphere, keeping reflected sunlight from escaping and causing the heat wave....
comments powered by Disqus
- ‘The Interview’: Seven Other Controversial Film Releases in History
- New Stonehenge Discovery Hailed As 'Most Important In 60 Years'
- Judge Rules 14-Year-Old's Execution a 'Travesty of Justice' in Case in the Jim Crow South
- Lawsuit May Reshape Tourist Industry in History-Rich Savannah
- Rudolph the Red-Nosed Reindeer Turns 75