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The two graphs illustrate the relationship between the changes in atmospheric/global temperature with time (in years) when various natural and anthropogenic climatic factors are in existence. Both graphs show sharp, but fluctuating, observed temperature records in every span of five years, between 1900 and 1920. The observed temperature anomaly is recorded as -0.3oC after every five years for the entire 20 years. The observed temperature variance is seen to have a rising trend from 1920 up to 1945 after which there is a slight decrease in temperature up to 1960. The recorded temperature anomaly then continues to rise until it reaches a peak of 0.95oC. On the other hand, the line graphs of the climatic temperature models are smooth and depict a steady rise in temperature anomaly from 1900 up to 1960. In the first graph, which depicts natural and anthropogenic forcing, there is a sudden decrease in temperature anomaly of the models followed by a cumulative increase until the point where it reaches a peak value of 0.74oC. However, in the second graph, which involves natural climate forcing only, there is a decreasing trend in the temperature anomaly of the models.

One of the similarities between the two graphs is the general trend of the recorded observed temperature anomaly. In both cases, the gradients of the observed temperature records are the same. In addition, the gradients of the climatic models are similar between 1900 and 1960. This shows that the effects of greenhouse gases and pollution aerosols on the atmosphere are long-term and can only be observed after many years. There is a sharp difference in the graphs of the climatic models between 1960 and 2000. In the first graph, the observed temperature and temperature anomaly line graphs of the models have almost the same magnitude and gradients. However, in the second one, there is a sharp disjoint...

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