About 1.5 million years ago, the mid-depth waters of the tropical Pacific Ocean suddenly grew cooler. The change came rapidly, and it spread across thousands of kilometers.
Before then, Earth’s climate had been relatively stable….
About 1.5 million years ago, the mid-depth waters of the tropical Pacific Ocean suddenly grew cooler. The change came rapidly, and it spread across thousands of kilometers.
Before then, Earth’s climate had been relatively stable….