when did climate change start to happen
Current climate change began at the beginning of the industrial revolution, in response to increases in atmospheric carbon dioxide from the burning of fossil fuel. The initial change was very small. We can see much more dramatic effects beginning about 30 years ago, and CO2 levels eclipsed 350 ppm. A: Climate change has always happened. The current cycle is similar to the past 4 in the trends, although this has been the coolest of the five we know of. The current cycle started roughly 10,200 years ago.