How can this be asserted (asserted first, btw);
“But on a global basis, all available evidence indicates that human activities are emitting much more carbon dioxide than volcanoes.”
if this;
“the satellite cannot be used as a routine volcano monitoring tool because it does not pass over the same place on the Earth frequently enough.”
...seems the logic is off (or an agenda is ON, imo)
I would say both are true. The logic is off because an agenda is on.