Answer:
Changes in the composition of the atmosphere
Explanation:
Although this answer is very vague and generalized, it is the correct answer.
The increase in greenhouse gas emissions in the atmosphere from modern manufacturing and engineering has increase carbon dioxide and methane concentrations in the upper atmosphere. These gasses have a chemical composition that allows the absorption and release of longwave radiation back to the Earth's surface slowly increasing the global average temperature.
If the driver had only consumed the 2 beers as he claimed, he would show little to no signs intoxication. He would be slightly frightened for being pulled from over but he would not be overly relaxed such as being overly friendly with the police officer.
