Co2 is released into the atmosphere -> carbon absorbed by plants, animals take it in and release it through respiration -> animals die ten decompose, the carbon is trapped in their fossils, when fossil fuels are burnt through combustion and machines, carbon is released into the atmosphere -> carbon can also be released into the oceans which releases CaCO3, this can affect the biodiversity in the ocean, it kills coral which releases enzymes and it also harms the sells.