For self-assessment questions, with exercises and discussions, just click on the correct topic at Biology GCSE & IGCSE Question Bank. The s-cool revision site lets you revise the topic, summarizes the topic & tests you on it. Skoool gives you a lesson, including progress questions, for each Biology topic but you’ll need sound on for it. 

Here are key terms and some definitions: Key Terms B11

Eutrophication – a short video from The Virtual School:

Mr W sings Seven ways to reduce carbon.

Science in Focus – The Human Impact – a 19m video and here’s a short (less than 5 minute) video clip from BBC iScience – Acid Rain.

What really happens to the plastic you throw away:

The Great Pacific Ocean Garbage Patch: