Project ID799
DescriptionEarth’s atmosphere evolved from its beginning with 95% carbon dioxide and no oxygen to the current day composition of 21% oxygen and 0.04% carbon dioxide 4.5 billion years later, but those of Venus and Mars stayed very much the same, at least in composition. My talk attempts to provide an explanation for this observation in three parts: 1) The evolution of the Earth’s atmosphere during the past 4.5 billion years and the important interplay between the atmosphere and the evolution of life. 2) The carbon cycle and greenhouse effect that control the small variations in the present day atmosphere (nevertheless a potentially serious threat for humans). 3) The contrast between the destinies of Venus, Earth and Mars.
TypeU3A-led research (not an SLP)
U3AWadhurst U3A
Year started2018
Source of referenceTalk given at the U3A Science Network Meeting, Nottingham, 2018
OutputNone known
NotesThis talk is available to other U3As