How does Earth maintain a constant level of oxygen?

It doesn’t! The oxygen level of the planet has varied quite dramatically in the last 500 million years. It was 35 per cent during the Carboniferous period, around 300 million years ago; as the climate, cooled and land plants died off, oxygen fell to as low as 12 per cent by the beginning of the Triassic. Back then, the air at sea level would have felt thinner than at the top of the Alps today.

Burning fossil fuels has reduced oxygen levels very slightly – about 0.057 per cent over the last 30 years. Deforestation only has a small effect because when rainforest is cut down, other plants are usually grown in its place. But it’s marine phytoplankton (plant plankton), rather than trees, that produces about 75 per cent of atmospheric oxygen. Global warming will have a significant impact on phytoplankton, which is a much more serious threat to oxygen levels.

Comments

Most visited

💤 Best Workouts for Better Night Sleep

Struggling to fall asleep even after a long day? You’re not alone. In our fast-paced world, quality sleep has become a luxury . While many turn to caffeine cuts or meditation, there’s another powerful (and often overlooked) remedy— exercise . The right kind of workouts can calm your body, balance your hormones, and prepare your mind for restful, deep sleep. Let’s explore the best workouts to help you sleep better at night . 1. Yoga: Stretch Your Stress Away 🧘‍♀️ Yoga combines gentle stretching with controlled breathing, making it a perfect pre-bedtime workout. Poses like Child’s Pose, Legs-Up-the-Wall, and Reclining Butterfly help relax tense muscles and lower your heart rate. Studies show yoga reduces cortisol (stress hormone) and promotes melatonin (the sleep hormone). 👉 Best time : Evening, 1–2 hours before bed. 2. Walking: The Simplest Sleep Booster 🚶‍♂️ A light 20–30 minute walk in the evening can do wonders for your sleep cycle. Walking helps regulate your...

Apple Event 2025: "Awe Dropping" - Complete Review with Pricing and Our Ratings

Apple delivered what many are calling its most significant product refresh in years at the "Awe Dropping" event held on September 9, 2025. Apple announced the iPhone 17 among other new products at its biggest moment of the year, introducing groundbreaking designs and revolutionary features that could reshape the smartphone landscape. From the ultra-thin iPhone Air to enhanced health tracking capabilities, here's our comprehensive review of everything Apple unveiled. The Star of the Show: iPhone Air - A Design Revolution What Apple Announced Apple announced the first major redesign of the iPhone in years when it confirmed the launch of a new, thinner model called the iPhone Air, with CEO Tim Cook calling it the "biggest leap ever for iPhone". The Air, starting at $999, has an ultrathin design that is just 5.6 millimeters thick, about 28% thinner than the standard iPhone 16. Key Specifications Display : 6.55-inch Super Retina XDR display Thickness : Just 5...

☄️ Comet 3I/ATLAS: The Rare Interstellar Visitor Captivating Astronomers Worldwide

In the vast expanse of our solar system, visitors from beyond are extraordinarily rare. On July 2, 2025 , astronomers confirmed the discovery of Comet 3I/ATLAS , marking only the third time in recorded history that an interstellar object (ISO) has been identified passing through our Solar System. This cosmic wanderer has captured the attention of scientists and stargazers alike, offering a once-in-a-lifetime opportunity to study material from another star system. Travelling at 58 km/s and exhibiting distinct cometary activity, 3I/ATLAS is already providing insights into the composition and evolution of distant stellar systems. 🔭 The Discovery: A Triumph for Astronomy The NASA-funded ATLAS survey telescope in Chile first reported that the comet originated from interstellar space on July 1, 2025. Named 3I/ATLAS —where “3I” denotes “third interstellar”—the object was initially spotted by the Deep Random Survey remote telescope . Amateur and professional astronomers worldwide qui...

Search This Blog