The smartest guy since Einstein tells us how scientific process works:
“In general, we look for a new law by the following process: First we guess it; then we compute the consequences of the guess to see what would be implied if this law that we guessed is right; then we compare the result of the computation to nature, with experiment or experience, compare it directly with observation, to see if it works. If it disagrees with experiment, it is wrong. In that simple statement is the key to science. It does not make any difference how beautiful your guess is, it does not make any difference how smart you are, who made the guess, or what his name is — if it disagrees with experiment, it is wrong.”
Global Warming is not a valid theory because the data does not match theory that increased CO2 levels forces warming. Those that keep asserting the failed Global Warming theory are not practicing science, they are acting more like religious zealots. They do not care in the least that their computer models are dead wrong, they only care about keeping their religious beliefs alive.