Leaving aside some of the other misconceptions here, the key problem is this.
Water vapor is homeostatic on a very short time scale (days); its
contribution averaged over the whole atmosphere perhaps varies enough
from year to year to make a measurable contribution to variability,
but it cannot sustain a trend.
Carbon in the biosphere is homeostatic on a time scale comparable to
that of geologic processes (hundreds of thousands of years) though
there are a bunch of reservoirs within the system that will mitigate
our effects over shorter time scales (thousands of years). We are
injecting carbon with
a time constant of about twenty years. On the time scales on which we
live it can sustain a trend, and unfortunately, it is.
mt
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