Photo: Ancient Warming Caused Huge Spike in Temps, Study Says



A chart of temperature data for the past 65 milion years shows the sudden and brief spike known as the Paleocene-Eocene thermal maximum (PETM).

The spike may have been caused when vast icelike reserves of greenhouse gases melted in response to a small warming event, according to a new study that raises dire possibilities for Earth's current warming.

Image by Robert A. Rohde/Global Warming Art under GNU Free Documentation License Version 1.2


NEWS FEEDS    After installing a news reader, click on this icon to download National Geographic News's XML/RSS feed. After installing a news reader, click on this icon to download National Geographic News's XML/RSS feed.

Get our news delivered directly to your desktop—free.
How to Use XML or RSS

ADVERTISEMENT

NATIONAL GEOGRAPHIC'S PHOTO OF THE DAY

50 Drives of a Lifetime

Listen to your favorite National Geographic news daily, anytime, anywhere from your mobile phone. No wires or syncing. Download Stitcher free today.