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Since when is there concern for climate change and to what extent?

Early attempts to understand climate phenomena resulted in conceptual models. Greek astronomer-geographers such as Eratosthenes (3rd century BCE) deduced the Earth’s spherical shape and connected climate to the inclination of the sun. Ptolemy (2nd century CE) divided the Earth into different climatic zones. In the 19th century Tyndall and Chamberlin found the carbon cycle to play an important role in understanding of climate. Their theory was rejected after Ångström and others concluded water vapor’s effect on Earth’s temperature overwhelmed that of CO2.

The interest in climate change made a jump to the modern era - time measurements and rapid transmission of information, followed by another jump to the appearance of information processing technology.

In modern times by assessing qualitative and quantitative of the climate variables, the race against time, began with Richardson's experiment (History of climate modeling; Paul N. Edwards). From antiquity through the work of Aristotle: Meteorology by Aristotle.