Can Climate Change without Increases in Atmospheric CO2?

What if there has not been any discernible increase in CO2 emissions in the past 50 years? Or, in the past 100 years? Or, even in the past 150 years? How would scientists supporting the theory for Anthropogenic Global Warming account for the rises in global temperatures?

In an article appearing in ScienceDaily (12/31/2009) the conclusion that climate has NOT changed because of increases in anthropogenic CO2 was reached. The article: No Rise in Airborne Fraction of Carbon Dioxide in Past 150 Years, New Research Finds was extracted from details published in the Geophysical Research Letters.

What exactly would that mean if it were true? Here is the key point of the article.

• Apparently, only 45% of ALL emitted carbon dioxide stays in the atmosphere. Most of the anthropogenic (caused by humans) carbon dioxide emissions are absorbed by oceans and terrestrial ecosystems!
  
  Another way of saying this is that the balance between airborne and absorbed fraction of carbon dioxide has stayed approximately constant since 1850.

A second ScienceDaily article (11/11/2009): Controversial New Climate Change Data/Is Earth's Capacity to Absorb CO2 Much Greater than Expected?, concludes that terrestrial ecosystems and the oceans have a much greater capacity to absorb CO2 than had been previously anticipated.

However, with all good news must come some bad news - The Awakening.

It seems that many scientists also believe that the ability of plants and oceans to absorb carbon dioxide has begun to decline and that the airborne fraction of anthropogenic carbon dioxide emissions is therefore beginning to increase.