2010 so far "tied for hottest year"
* 2010 tied for hottest year alongside 2005, 1998
* Scientists watch decade trend rather than individual years
By Gerard Wynn and Alister Doyle
LONDON/OSLO, Nov 24 (Reuters) - This year is so far tied for the hottest year in a temperature record dating back to 1850 in a new sign of a warming trend, the three major institutes which calculate global warming estimates told Reuters.
U.N. climate talks resume next week in Cancun, Mexico, where expectations are no longer for a comprehensive deal to slow warming, but smaller progress for example to curb deforestation, in a bid to agree a pact next year or later.
The previous conference in Copenhagen last year fell short of hopes, but about 140 countries have agreed a non-binding deal to try and limit warming to less than 2 degrees Celsius.
Temperatures are now about 0.8 degrees above pre-industrial levels, and 2010 is about 0.5 degrees above the 1961-1990 average, near the record, with two months data still to collect.
Even with a possible cool end to the year, 2010 is expected to be no lower than third in a record where 1998 and 2005 are warmest. The U.N. panel of climate scientists says higher temperatures mean more floods, heatwaves and rising sea levels. Continued...