We have a lot to thank photosynthesis for. Our entire existence, for a start. About 3 billion years ago, a group of microbes called cyanobacteria evolved a way to turn light and water into energy, releasing oxygen in the process. These microbes would eventually flood our atmosphere with oxygen—turning it from a toxic miasma of mostly nitrogen and carbon dioxide into the life-sustaining mix we have today. All of it—plants, humans, dogs, Netflix, ice cream—started with photosynthesis, more or less.
The same process is also right at the beginning of everything we eat. Plants use sunlight, water, and carbon dioxide to grow, and then humans either eat those plants directly
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