Final answer:
The severity of George's COPD can be classified as moderate based on his FEV1 percentage of 80%.
Step-by-step explanation:
The severity of George's COPD can be classified based on his forced expiratory volume in 1 second (FEV1) percentage. In obstructive lung disease, such as COPD, the FEV1/FVC ratio is lower than in persons with restrictive disease. A FEV1 percentage of 80% suggests moderate severity of COPD. This means that George's ability to forcefully exhale air in 1 second is reduced but not severely compromised.