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I am not aware of people changing where they are on the climate belief scale. I can't speak for everyone, especially attention-seeking YouTubers.
Of course, human CO2 emissions have caused the atmosphere to warm by about 1 degree Celsius over the last 140 years.
However, this issue is far more complicated than that. Climate Alarmism very much depends upon as of yet unproven positive feedback mechanisms. The solutions to Climate Change are likely more expensive and damaging to our economy than they are worth.
There are many factors that contribute to people's doubt, which is maybe why it would appear that people are shifting positions. Just to name a few: The politicization of science. Poor past predictions. The urban heat island effect. The uncertainty associated with clouds. The large error bars in the models. Temperature data that is estimated based on models. The alteration of past temperature data. Climategate "hiding the decline". One third of the people on the IPCC are members of an environmental lobbying group, which is a conflict of interest. The IPCC refused to hire anyone who did not already believe in catastrophic-man-made warming, which is what they are supposed to evaluate. (You don't do science by starting with the conclusion.) The former head of the IPCC called catastrophic-man-made warming his "religion". (No bias there!) A former IPCC member said that it wasn't about climate but about doing away with free-market capitalism.
Some climate scientists said that they were afraid to speak out against climate alarmism because they would lose funding. There is no 97% consensus. There are many actual climate scientists who think the alarmism is overblown.
We are in a brief interglacial warm period. All of human civilization arose during this brief warm period. We are halfway between the Earth's maximum tilt, which melts glaciers, and its minimal tilt, which allows glaciers to grow. Over the very long term, global cooling will be the problem. What humans have done to the atmosphere is trivial, and we will be running out of most fossil fuels by the year 2100. We might run out of oil reserves in 40 years.
Most climate charts go back to 1880 which was an unusually cold period that killed many people in North America. Cold kills far more people than heat, and the 1-degree increase since 1880 has been an improvement. It would be an unlikely coincidence if we were currently at the optimal temperature for human beings.