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(Source: The Copenhagen Diagnosis, 2009) Here, the models have understated the problem.In reality, observed sea level is tracking at the upper range of the model projections.Short Answer: The term relative dating is distinguished from absolute dating to make it clear that one does not get a specific estimate of the age of an object from relative dating, but one does get such an estimate of true age from absolute dating.There are several techniques employed in both sets of methods. Long Answer: Sciences such as geology, paleontology and archeology are very interested in identifying the age of objects found and these scientists sometimes use both relative dating or absolute dating to characterize the age of the objects they study.The difference between relative dating and absolute dating is that relative dating is a method of sequencing events in the order in which they happened.
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There are other examples of models being too conservative, rather than alarmist as some portray them.
All models have limits - uncertainties - for they are modelling complex systems.
Before radiometric dating (or other methods of absolute dating like counting tree rings) it was difficult to determine the actual age of an object.
Radiometric dating, based on known rates of decay of radioactive isotopes in objects, allows a specific age of an object to be determined to some degree of accuracy.