“High Confidence” Earth Is Warmest in 400 Years – Maybe Even 2,000 Years.

Left: Observed Arctic summer sea ice in 1979. Right: Observed Arctic summer sea ice in 2003. 20% decline in last twenty-seven years. Summer sea ice could be gone entirely by the end of the 21st Century. Source: ACIA 2004. — **Left**: Observed Arctic summer sea ice in 1979. **Right**: Observed Arctic summer sea ice in 2003. 20% decline in last twenty-seven years. Summer sea ice could be gone entirely by the end of the 21st Century. Source: ACIA 2004.

Polar bears must wait for the summer sea ice to re-freeze each fall so they can hunt seals. But if current greenhouse gas emission levels continue to rise and warm Earth, Arctic summer sea ice will continue to melt and eventually not freeze. Then, polar bear extinction is a probability. Image © Thomas D. Mangelsen, naturestock.com.

June 24, 2006 Edmonton, Alberta, Canada - On June 22, the National Academy of Sciences officially reported to Congress "a high level of confidence" that Earth is the warmest it’s been in at least 400 years. There is also proxy evidence as far back as 900 A.D., more than eleven hundred years ago.

In its press release, the Academy stated: “There is sufficient evidence from tree rings, boreholes, retreating glaciers, and other ‘proxies’ of past surface temperatures to say with a high level of confidence that the last few decades of the 20th century were warmer than any comparable period in the last 400 years.”

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