Richard Alley: How do We Know CO2 Rise is Man Made?  December
21, 2010  The Science Guy for Climate wonks is back, with a
characteristically simple explanation for how we know the
current CO2 rise is man made.  About these ads  3 Responses to
“Richard Alley: How do We Know CO2 Rise is Man Made?”    1.
otter17 Says:      Nice little presentation. If only the major
news outlets would produce documentary-style coverage on climate
change featuring practicing scientists like Dr. Alley, Hansen,
Santer and the like, the world would be a better place.      A
couple questions and a request:      Question #1:     Why does
melting in a volcano not consume oxygen? Does it use oxygen from
an underground source (non-atmospheric O2)? I have only a
collegiate introductory knowledge of chemistry, but wouldn’t
there be oxygen required in some way to create CO2?
Question #2:     What type of materials are melting beneath the
earth’s crust to create the CO2 out-gassing from volcanoes? I
was under the impression that there w