The Pliocene epoch, which lasted from 5.3 million to 2.6 million years ago, was a consequential time in Earth's history. The Isthmus of Panama formed, connecting North and South America, and the ...

Global Temperature Rise The Earth's climate has undoubtedly changed, as evidenced by the rise in global temperatures. 2°F).

Temperature Extremes In the not-so-distant past, the world's climate showed a comforting predictability. Average global temperatures were fairly stable, and the four seasons followed one another like ...