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Vaniver comments on What is up with carbon dioxide and cognition? An offer - Less Wrong
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Photosynthesis requires light to occur; weather affects the amount of light. Direction of wind determines the amount of upwind plants, and so on. Here's a link to a week's worth of data from an outdoor CO2 monitor in Utah; it looks to me like the difference is probably imperceptible, even if one buys the effect sizes for the 600 to 1000 ppm study.
Interesting... I expect the main drivers to be the seasonal cycle (outside of the tropics) and the diurnal cycle.
Here is a nice animation of the seasonal cycle which also demonstrates the asymmetry of the Northern and Southern hemispheres...