2 Human activities have changed the composition of the atmosphere since the pre - industrial era Watt's steam engine Begin industrial period (slideplayer.com)
Future civilisations could then use these to build up to their own industrial periods, before collapsing and starting the cycle again. (climatedepot.com)
Taken together, the addition of manufactured salt to the food supply and the displacement of traditional potassium - rich foods by foods introduced during the Neolithic and Industrial periods caused a 400 % decline in the potassium intake while simultaneously initiating a 400 % increase in sodium ingestion (4,12,159). (academic.oup.com)