Explain why breathing in air rich in carbon dioxide is dangerous.

It increases the acidity of the blood and tissue fluids, inhibiting enzymes and stopping essential metabolic processes.

It also reduces the affinity of haemoglobin for oxygen so that little oxygen is delivered to the tissue from the lungs

Accumulation of carbon dioxide also interferes with respiration at the cellular level by inhibiting respiratory enzymes.

This may eventually cause tissue death as a result of lack of enough oxygen