01Evolution of the Atmosphere
Before you can understand how the atmosphere has changed, you need to know what it's made of today. This video gives you the three main gases and their percentages in a form you can use in any question — as fractions, percentages, ratios, or parts per million — and explains why that composition has barely changed in 200 million years. Short, focused, and exactly what the GCSE specification asks you to recall.
02Greenhouse Gases & Climate Change
03Carbon Footprints
04Air Pollution
This video explains what acid rain is, where the sulfur dioxide and nitrogen oxides that cause it actually come from, and what the chemistry of their reaction with atmospheric water looks like. You'll get the word equations and conditions the GCSE exam expects, understand why combustion engines and burning biomass are the key sources, and finish on an evidence-based look at how emissions across Europe have fallen dramatically since the 1990s.