carbon dioxide

Take a deep breath

Take a deep breath

In the first episode of this climate change series, we met the stars of our drama: the greenhouse gases carbon dioxide, methane and others. We know the levels of these gases are increasing in the atmosphere because of the pioneering work of Charles Keeling, whose observations atop Mauna Loa on the big island of Hawai’i showed a steady increase in CO2 from the early 1950s to the present.

How do we know the source of Keeling’s extra CO2 is in fact human activity in the industrial era and not simply natural variability in atmospheric CO2?

Carbon dioxide: nature's tiny solar panels

Carbon dioxide: nature's tiny solar panels

Carbon dioxide, like chocolate, is a good thing in moderation.  Without carbon dioxide gas in our atmosphere, life as we know it could not exist.  This is because carbon dioxide molecules are nature’s own tiny solar panels—absorbing, retaining and re-emiting heat from the sun. 

However, as the concentration of carbon dioxide increases, the atmosphere is able to retain more and more heat, with consequences for life on our planet.