April 22, 2019
Got a burning question about climate change? “You Asked” is a series where Earth Institute experts tackle reader questions on science and sustainability. To submit a question, drop a comment below, message us on Instagram, or email us here.
Today’s question comes via our Earth Month Q&A on Instagram:
Why is there 21% oxygen and 0.03% carbon dioxide in the atmosphere?
Answer provided by Jason Smerdon