Okay, at
Atomz web site (first one on google when searching for "CO2 exhaled by a human in one year"), you see that for
all humans there are about 2.23 gigatons of CO2 per year with about 3 teratons of CO2 currently in the atomosphere. Obviously human exhalation is not a major source of CO2 - only 0.001115% by breathing from the human species. (No account was made for our livestock.)
"CO2 is not a greenhouse gas" - as stated above, it is. Take a few science courses to understand the scientific method (replication, reproducibility, independent verification, prediction) then read up on the evidence supporting CO2 as a greenhouse gas. While your at it, read up on how particulates and albedo of glaciers/ice also influence temperatures.
"Humans devices do not produce enough CO2 to influence global atmospheric concentrations" - again, crack open some books and scientific journals. Heck, read statistical reports from various state DOTs, the EPA, and other governmental agencies. Believe it or not, there are many states where people have to take their cars in to have their emission levels tested - and they record and analyze this data. They use the wonderful mathematical invention of statistics to make accurate predictions. (So add taking a stats course or two to your list.)
"Warming is caused by the sun, thus greenhouse gases don't cause temperature fluctations". Now add taking a course on argumentative composition or logic - or regularly read
R. Moody's logical fallacy of the day. Learn that logic arguments like "how can you believe his statement that most US citizens don't save enough money - he's disshevelled, smelly, and an atheist so he can't be right!" are invalid and unsound, as are arguments like "all crows are black birds, therefore the black bird I see must be a crow". The point is this - just because sun spot fluctuations and thus solar radiation fluctuations can cause global temperature variations, not all variations in global temperatures are solely caused by fluctuations in solar activity/radiation.
So, once you actually understand what science is - such as the drastic definition of a theory in science (a hypothesis that has been tested repeatedly over many, many, many replications by independent parties that has yet to be proven false) versus in common speach (a guess) - and have a solid foundation in the sciences required (statistics and other forms of mathematics, chemistry, biology, physics, and logic/argument - and perhaps a bit of policy science), you'll be ready to make sound, valid, and rational arguments.
Until that time, I'll keep believing in greenhouse gases and anthropogenic influences on global greenhouse gas levels, the theory of evolution, and the
Universal Theory of Gravity - though I am sure there are those who will tell me the only reason that the book dropped on my foot was because God willed it since I'm one of those wacko SOBs who believes in the scientific method!