![Figure 1: Climatic events that changed the course of human history in the deep past, especially solar strength and Atlantic ice rafting Figure 1: Climatic events that changed the course of human history in the deep past, especially solar strength and Atlantic ice rafting](/sites/default/files/styles/large/public/4-8-img1622.jpg?itok=ddTZOd3S)
Figure 1: Climatic events that changed the course of human history in the deep past, especially solar strength and Atlantic ice rafting
![Figure 2: Various measures of global health and economy show a sharp increase around the time of the Industrial Revolution, mirrored by rising levels of CO2 and methane in the atmosphere Figure 2: Various measures of global health and economy show a sharp increase around the time of the Industrial Revolution, mirrored by rising levels of CO2 and methane in the atmosphere](/sites/default/files/styles/large/public/4-8-img1623.jpg?itok=H8Fjl5v-)
Figure 2: Various measures of global health and economy show a sharp increase around the time of the Industrial Revolution, mirrored by rising levels of CO2 and methane in the atmosphere
![Figure 3: Major changes to global climate measures before and during the Holocene period, highlighting CO2 and sea levels Figure 3: Major changes to global climate measures before and during the Holocene period, highlighting CO2 and sea levels](/sites/default/files/styles/large/public/4-8-img1624.jpg?itok=fR32TtOK)
Figure 3: Major changes to global climate measures before and during the Holocene period, highlighting CO2 and sea levels
![The maximum extent of glacial ice in the north polar area during the Pleistocene era](/sites/default/files/styles/large/public/4-8-img1626.jpg?itok=7W74ljrd)
The maximum extent of glacial ice in the north polar area during the Pleistocene era
Source: U.S. Geological Survey