When sunlight is adequate, leaves are happy. On some days, though, there can be too much of a good thing.
I asked the gardener how come, after all these years, the soil in my geranium pots is at roughly the same level.
From the specific energy of visible light to the unique properties of water, this degree of fine-tuning for life has a clear message.
Without this ensemble of fitness in nature, there would be no wood, no fire, no metallurgy, no modern technology.
Without lignin, there would be no woody plants, no wood, no coal, no charcoal, no fire, no pottery, and certainly no iron or metallurgy.