A timeline of 485 million years of Earth’s surface temperatures shows ancient greenhouse conditions were hotter than scientists thought.
Over the last 485 million years, Earth has been both a lot colder and a lot hotter than once thought.
These temperature shifts, surprisingly, also closely tracked shifts in atmospheric carbon dioxide, eclipsing other factors such as changing solar irradiance in driving Earth’s temperatures. Previous studies using multiple methods to estimate ancient greenhouse temperatures tended to track warmer than computer simulations alone for the same episodes. It turned out, the team found, that this underestimation of past warm periods extended to the entire Phanerozoic. In particular, Earth’s tropics were much warmer during these episodes than scientists previously thought.
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