Warnings about Climate Change aren't just a recent thing:

[MineralMan]

The history of the scientific discovery of climate change began in the early 19th century when ice ages and other natural changes in paleoclimate were first suspected and the natural greenhouse effect first identified. In the late 19th century, scientists first argued that human emissions of greenhouse gases could change the climate. Many other theories of climate change were advanced, involving forces from volcanism to solar variation. Thomas Edison, pioneer of electrical technologies, voiced concern for climate change and support for renewable energy in the 1930s.[1] In the 1960s, the warming effect of carbon dioxide gas became increasingly convincing. Some scientists also pointed out that human activities that generated atmospheric aerosols (e.g., "pollution&quot could have cooling effects as well.

Learn more at:

https://en.wikipedia.org/wiki/History_of_climate_change_science