Question

the average global temperature (shown in this graph) roughly reflects the change in average greenhouse gas concentrations over the last ~150 years. based on this graph, in approximately what year would greenhouse gas concentrations have been the highest? average global temperature 1880 - 2021

Explanation:

Step1: Analyze the relationship

The problem states that average global temperature roughly reflects the change in average greenhouse gas concentrations. So, higher temperature implies higher greenhouse gas concentrations.

Step2: Identify the highest - temperature year

Looking at the graph of average global temperature from 1880 - 2021, we need to find the year with the highest temperature value. Among the given options (1908, 1944, 1998, 2020), by visual inspection of the line graph (the line is upward - trending and 2020 is the most recent year in the range and near the peak of the temperature curve), 2020 has the highest temperature.

Answer:

2020