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.
Eutrophication – a short video from The Virtual School:
Mr W sings Seven ways to reduce carbon.
A lesson on Acid Rain from Mr Dare:
Here’s a short (less than 5 minute) video clip from BBC iScience – Acid Rain.
Science in Focus – The Human Impact – a 19m video and
What really happens to the plastic you throw away:
The Great Pacific Ocean Garbage Patch:
IGCSE Biology: Coursebook, chapter 16, pp. 232 – 241