The northern hemisphere has a slightly greater 0.041% CO2 content in the air. The difference between the seasons is this. The northern hemisphere, which has the most population, industry, transportation, and nearly all deciduous trees, contains the majority of the Earth's landmass.
Therefore, as leaves start to grow in the spring, they absorb CO2 from the atmosphere, slightly lowering the concentration. Additionally, people use less heating in their homes and buildings, which lowers CO2 emissions .Because the southern hemisphere's large population centers, like Brazil, are primarily tropical, there is less heating in homes there. The same is true for most of Australia and some African nations. Trees and other plants are mostly evergreen due to the region's predominantly tropical and subtropical climate. For instance, Tasmania is home to the sole native deciduous tree of Australia. As a result, the southern hemisphere's carbon dioxide concentration, which is roughly 0.0400%, is slightly lower and less variable.
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