Atmospheric Chemistry and Climate Change
Earth's atmosphere has undergone a massive makeover over billions of years, and understanding this story helps explain today's climate change challenges.
The early atmosphere was mostly carbon dioxide and water vapour - definitely not breathable! As oceans formed, they dissolved CO₂, and later plants and algae converted remaining carbon dioxide into oxygen through photosynthesis. This gradual process created the atmosphere we depend on today.
Greenhouse gases like water vapour, carbon dioxide, and methane naturally keep Earth warm by absorbing long-wavelength radiation reflected from the surface. However, global warming results from increasing concentrations of these gases, though predicting exact climate changes remains incredibly challenging.
Atmospheric pollutants cause serious health and environmental problems. Carbon monoxide binds to haemoglobin, reducing oxygen transport in blood. Sulphur dioxide creates acid rain that corrodes metals and erodes stone. Nitrogen oxides cause breathing problems, while carbon particulates trigger health issues.
Your carbon footprint measures CO₂ released through your actions, but calculating it accurately requires considering manufacturing, transport, and energy use throughout a product's entire lifecycle.
Key Distinction: Remember that weather describes short-term atmospheric conditions, while climate refers to long-term patterns across entire regions.