The atmosphere is made of 20 percent oxygen. Explain why an increase in oxygen in the atmosphere to 50 percent would be dangerous to living things
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Even though oxygen is not a heat-trapping greenhouse gas, its concentration in our atmosphere can affect how much sunlight reaches the ground, and new models suggest that effect has altered climate in the past.Oxygen currently makes up about 21 percent of the gases in the planet’s atmosphere, but that level hasn’t been steady over Earth’s history.
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