In addition, the data representing the earth’s effective temperature over the past 150 years,
show that a global human contribution to this temperature can not be distinguished or isolated
at a
measurable level above that induced by clearly observed and understood,
natural effects, such as the partially cyclical, redistribution of surface energy in the El Nino.
Variations in solar energy, exotic charged particles in the solar wind, cosmic ray fluxes,
orbital and rotational characteristics of the planet’s motion together provide a rich combination
of electrical and mechanical forces which disturb the atmosphere individually and in combination.
Of course, that doesn’t mean that carbon dioxide is not a “greenhouse gas”,
so defined as one which absorbs radiation in the infra red region of the spectrum.
However, the “human signal”, the effect of the relatively small additional gas that human activity provides annually to the atmosphere,
is completely lost, being far below the level of noise produced by natural climate variation.