• What is it? The atmosphere is a fancy cocktail mix of solids, liquids, and gases held close to Earth by gravity.
• Main ingredients: Nitrogen (78%), Oxygen (21%), Argon (0.9%), and then a pinch of trace gases like carbon dioxide, helium, and ozone. Don't forget the sprinkle of water vapour and solids like dust, ash, and soot!

🌧️ Fun Fact: Ever wondered where our weather happens? It's mainly in the lowest 16–17 km called the troposphere.

• In the troposphere, it gets cooler the higher you go! On average, temperatures drop 6.5°C for every km you climb.
• This is also where most of our water vapour is found. Go higher, and it's too chilly for water vapour to hang out!

• Humans are party crashers! We change the atmosphere's composition.
• Effects? Messing with gases can have big impacts on nature. For instance:
  • Less ozone? Marine life takes a hit because of reduced photosynthesis. Poor fish eggs and larvae might get damaged too.
  • Too much CO₂? Hello, global warming! Ecosystems might just flip out.
  • Water woes: Both too much or too little can shake up ecosystems.

• From the 1950s-early 1990s, some places like Russia experienced up to 30% less sunlight! Why? Pollution.
• Polluted air = more particles = more places for water to stick. Result? Smaller water droplets in clouds.
• Smaller droplets = clouds acting like giant mirrors, reflecting sunlight. So, less sunshine reaches Earth.

🔍 Real-world Example: Imagine wearing a white shirt on a hot day. It reflects more sunlight, keeping you cooler. Polluted clouds do the same thing for Earth!