Question

When did the climate first start to change

Answer 1

19th Century

Step-by-step explanation:

From research climate change started in the early 19th century, when ice ages and other natural changes in paleoclimate were first suspected and the natural greenhouse effect was first identified.

Answer 2

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 was first identified