Pynciau a Argymhellir
- Effect of human beings on 2 canlyniadau
- Nature
- Environmental aspects 1 canlyniadau
- Environmental sciences 1 canlyniadau
- Evolution 1 canlyniadau
- Evolution (Biology) 1 canlyniadau
- Gaia hypothesis 1 canlyniadau
- Origin 1 canlyniadau
- Physical geography 1 canlyniadau
- Pollution 1 canlyniadau
- Sustainable living 1 canlyniadau