I think more and more people are exposing themselves to the views of scientists such as William Happer and Willie Soon, who argue that the Earth has always experienced major climate swings long before humans emitted significant amounts of CO₂. They point to the Medieval Warm Period, when England supported vineyards, followed by the Little Ice Age, when the River Thames regularly froze. Those changes occurred naturally, suggesting that climate has powerful natural drivers.
They argue that while CO₂ is a greenhouse gas, its warming effect diminishes as its concentration increases because its main absorption bands become increasingly saturated. Additional CO₂ still has an effect, but they contend it is much smaller than is commonly claimed. They also note that water vapour is by far the dominant greenhouse gas.
According to this view, the Sun, together with changes in cloud cover, ocean circulation, and other natural cycles, has a much greater influence on climate than current models allow. Climate models rely on assumptions about positive feedbacks that amplify the effect of CO₂, but those feedbacks are uncertain. If those assumptions are incorrect, the models will overestimate warming.
They further argue that climate models have often predicted more warming than has been observed over certain periods, suggesting they are too sensitive to CO₂. In their view, scientific theories should ultimately be judged by how well they predict reality, not by consensus.
We are almost certainly heading towards a warmer period, much like the Medieval Warm Period, but it may be driven largely—or even entirely—by that big round ball of fire in the sky: the Sun. There is now an industry built around climate modelling and the effort to combat human-induced global warming, with vast amounts of public money being directed towards it. Arguably, that money would be better spent preparing society for what may simply be natural changes in the Earth's climate. If that were accepted, however, much of that industry would disappear, and many powerful people would stand to lose financially.