One of the challenges of looking at the global temperature changes is the natural year-to-year variability is larger than decade trends mostly due to three sources: ENSO, solar cycles and volcanic eruptions.
An interesting paper has come out with examines the surface land, ocean and satellite data over the past 35 years remove those variables using statistical methods and than compare the temperature trends of the remainders. They trends are consistent across the data sets and show a steady rise. It's a pretty elegant way to look at the data.
Here's an article for the general public about the paper:
The Real Global Warming Signal | Open Mind
Here's the abstract of the paper. Most large libraries carry the journal.
IOPscience - Global temperature evolution 1979
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