Grass and trees are pretty bad at converting sun into glucose. Main enzyme in photosynthesis Rubisco is both slow (few molecules per min vs several hundred per second) and lowly selective (confusing O2 for CO2 regularly).
Which makes sense, for most of Earth's geological history CO2 was more abudant. So chance of mistaking O2 and CO2 was nil.
Which makes sense, for most of Earth's geological history CO2 was more abudant. So chance of mistaking O2 and CO2 was nil.
https://youtu.be/vYVSH2RpHcQ?feature=shared