Question

we can observe seasonal fluctuations in atmospheric co₂ levels by looking at monthly data. data collected over many decades, such as the data collected at the mauna loa observatory in hawaii, can show us how atmospheric co₂ levels have changed over longer time periods. the graph shows the amount of co₂ in the atmosphere between 1958 and 2025. source data: noaa global monitoring laboratory, measured at the mauna loa observatory. select the true statements about atmospheric co₂ levels from 1958 to 2025. the atmospheric co₂ concentration increased by more than 50 ppm between 1970 and 1990. the concentration of co₂ in the atmosphere slowly decreased from the 1980s to the 2020s. the atmospheric co₂ concentration in 2020 was approximately 100 ppm greater than it was in 1960. the long - term increase in atmospheric co₂ levels has been much greater than the short - term seasonal increases and decreases caused by photosynthesis.

Explanation:

• For the first statement: By observing the graph, we can estimate the \(CO_2\) concentration in 1970 and 1990. The increase is more than 50 ppm.
• For the second statement: From the 1980s to 2020s, the overall trend of the graph shows an increase, not a decrease.
• For the third statement: Comparing the \(CO_2\) concentration in 2020 and 1960 from the graph, the difference is approximately 100 ppm.
• For the fourth statement: The long - term upward trend (long - term increase) in the graph is more significant than the small - scale seasonal fluctuations (short - term changes due to photosynthesis).

Answer:

The atmospheric \(CO_2\) concentration increased by more than 50 ppm between 1970 and 1990; The atmospheric \(CO_2\) concentration in 2020 was approximately 100 ppm greater than it was in 1960; The long - term increase in atmospheric \(CO_2\) levels has been much greater than the short - term seasonal increases and decreases caused by photosynthesis.