Question

source data: noaa global monitoring laboratory, measured at the mauna loa observatory. determine whether each statement is true or false. analyzing atmospheric co2 levels over many decades reveals a similar trend to atmospheric co2 levels over any given year. seasonal fluctuations in atmospheric co2 levels are not influenced by land plant photosynthesis. the global atmospheric co2 concentration typically decreases from may to october, when more plants are growing in the northern hemisphere. the global atmospheric co2 concentration in the 2020s was lower than it had been throughout much of the previous sixty years.

Explanation:

1. Analyzing CO₂ levels over decades shows long - term trends different from short - term yearly trends. So the first statement is false.
2. Seasonal fluctuations in atmospheric CO₂ are mainly due to land plant photosynthesis. So the second statement is false.
3. In the Northern Hemisphere, from May to October when more plants are growing, they absorb CO₂, causing a decrease in global atmospheric CO₂ concentration. So the third statement is true.
4. The global atmospheric CO₂ concentration has been increasing over time, and the 2020s levels are not lower than previous sixty - year levels. So the fourth statement is false.

Answer:

1. False
2. False
3. True
4. False