We agree so far! as do scientists on both sides.
Now how much have we added?
The often repeated quote is that "97% of climate scientists accept man-made climate change" and therefore represent a consensus.
The reason the "consensus" matters is not political or "rule by majority", but hecause these scientists cover a variety of specialisms. It is because people studying the changes in concentration of co2 and other greenhouse gases in ice cores, the decline in glaciers, the bleeching of coral reefs, etc have all- largely independent of one another- reached the same conclusion.
Science
is a method but the consensus in science often reflects the fact that scientists reach the same conclusions from the same evidence even in conditions where political control is absent. The "galileo gambit" that what was once considered wrong in science becomes right is not true of political control of science but of new information that became avaliable forcing a change in the consensus or a "paradigm shift". Its "creative destruction" in terms of ideas. The deniers do not have new information so that is not the case for climate change.
There is just no evidence that we can see, you see. The sky looks pretty blue today and temperatures change as a normal part of nature. Or was the ice age a lie too? And if the ice age was a lie...where do the lies end.. lies or disproved "theories". For something as perfect as science, they have a lot of theories...
Would you dispute the fact the earth is round because you see the horizon is flat? Or that the earth is the centre of the solar system because it appears that the sun, stars and planets revolve around us?
Whilst free thought implies individualism, knowledge itself is not exclusively a product of the individual. We didn't learn everything from our own senses even if someone did at some point. We are "socialised" to accept certian ideas and our scientific knowledge is included in that. As such is the accumulation of social knowledge by everyone over time. True, it can be subject to distortion as "history is written by the victors" but in free socities at least, it is a problem of emphasis rather than politically motivated fabrication.