In every ecosystem, energy is transferred along food chains from one trophic level to the next.
The trophic level is the position that an organism occupies in a food chain - what it eats and what eats it.
Energy is absorbed up a food chain, but at each trophic level, this amount of energy decreases rapidly
The Earth is heating up as CO2levels are increasing – why?
Earth’s atmosphere is an insulating layer
It lets the Sun’s heat in but also stops some going out
Increase in carbon dioxide due to:
- 1. Deforestation (loss in photosynthesis)
- 2. Combustion of fossil fuels
Increase in methane due to:
- 1. livestock farming
- 2. rotting plant material
- 3. drilling for oil and gas