The basic premise that CO2 is a GHG that causes is warming is something that can be tested and therefore see that science as reliable.
yet... isn't that science you claim to accept as reliable also able to point to the principal source/causal tie of the CO2 causing today's relatively recent (global) warming?
OTOH, claiming that the current warming is unusual is a key part of the alarmist narrative so they have spent a lot of effort carefully selecting proxies that tell the story they want while rejecting those that cast doubt on it. They can get away with this subjectivity because they can't be proven wrong with real experiments.
which periods of past warming (
and their causal ties) do you understand/interpret as part of the skeptic/denier narrative that today's relatively recent (global) warming is not unusual - NOT unusual? As you speak of reliable science, what reliable... prevailing science are you relying upon to support your understood/interpreted narrative... skeptic/denier narrative?