Carbon dioxide is a greenhouse gas. That's what you exhale.

=v= What utter nonsense. When it comes to greenhouse gases,
quantity is of course as relevant as composition. The CO2
exhaled by the world's fauna is not a relevant quantity, not
even that from an overabundance of _Homo_sapiens_, not even
if all of us were hauling trailers up mountains.

Since trailers stick out into traffic ...

=v= More utter nonsense. First of all, we *are* traffic.
Secondly, I've towed many trailers, and all but one were
narrower than any car. (The one exception was a parade
float.)

On the other hand, the current theory is that global warming
is out and climate variability is in.

=v= Yet more utter nonsense. Global warming remains the
prevailing theory amongst the scientific community. Certainly
there are competing theories, as there always is in science,
but to characterize them as "current" and the prevailing
theory as "out" reflects a fossil-fuel-funded P.R. campaign
rather than scientific objectivity.

On the internet, nobody knows you're a jerk.

=v= Wrong yet again. Dang, bwah, if you're going to be spending
your Saturday nights on the Internet, perhaps you ought to
devote some of that time to ree-search.
_Jym_