Temperature histories from paleoclimate data (green line) compared to the history based on modern instruments (blue line) suggest that global temperature is warmer now than it has been in the past 1,000 years, and possibly longer. (Graph adapted from Mann et al., 2008.)
Image from NASA Earth Observatory. Source: https://earthobservatory.nasa.gov/Features/GlobalWarming/page3.php
Originally uploaded in CLEAN:Teaching Climate and Energy:Teaching Climate.
Image 188802 is a 237 by 720 pixel PNG
Uploaded: Jul11 18