2008 is set to be cooler globally than recent years say Met Office and University of East Anglia climate scientists, but is still forecast to be one of the top-ten warmest years.
Each January, the climate scientists at the university work with the British Met Office to forecast the expected temperature, taking into account conditions such as El Niño and La Niña, greenhouse gases, industrial aerosols, particulates, ocean trends and solar impact.
The assessment for 2008 is that there will be a "strong La Niña" event in the Pacific, which will limit the warming trend for the year (whilst still being one of the warmest years):
During La Niña, cold waters upwell to cool large areas of the ocean and land surface temperatures. The forecast includes for the first time a new decadal forecast using a climate model. This indicates that the current La Niña event will weaken only slowly through 2008, disappearing by the end of the year...