Ancient heat wave?Breaking News
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
- Letters collection offers unique glimpse into ordeal of Australian aborigines
- War, More Than ISIS, Is Destroying Syria's Ancient Sites
- Pew Poll: Trust in government is at historic lows
- If "The Donald" Said It Happened, It Happened! And Don't You Forget It!
- Solved: the mystery of Britain’s Bronze Age mummies
- Anne Frank Faced Challenges Similar to Syrian Refugees, Richard Breitman Says
- Douglass North, Nobel Prize-winning economics historian, dies at 95
- Craig Shirley says Ted Cruz is right and the Huffington Post wrong about Ronald Reagan’s 1980 Presidential Campaign
- Mystery at Notre Dame: A priest-historian has been forced to back off a project promoting authentic Catholic education
- William & Mary launching a gay history project