☀️ How Photosynthesis Reshaped the Earth’s Atmosphere 🌍 Long before humans existed, the Earth’s surface was dominated by inorganic processes - gravity, cosmic radiation, geological activity. But then, something revolutionary happened: Life began to change the planet. Around 2.5 billion years ago, photosynthetic microorganisms evolved the ability to harness solar energy, converting carbon dioxide and water into glucose and oxygen through oxygenic photosynthesis. 🌱 This process was not only biologically efficient - it was planet-altering. By consuming CO₂ and releasing O₂, these organisms triggered the Great Oxygenation Event, dramatically increasing atmospheric oxygen and reducing greenhouse gases. This shift laid the biochemical foundation for complex life and aerobic respiration. Until that point, Earth's evolution was purely physical. But now, life itself became a geological force, modifying the atmosphere and setting the stage for all future organisms - including us. 📖 What...