The level of carbon dioxide in the atmosphere before large scale use of fossil fuels began preindustrial CO2 level.
Pre-industrial levels, in theory, may apply to any time even before the beginning of the industrial revolution. But as we move back in antiquity, fewer direct temperature measurements are made.
Pre-industrial cultures are characterized by a number of social characteristics, including restricted productivity, a primarily agricultural economy, a limited division of labor, a limited range of social class, and just a generalized sense of parochialism.
Therefore, the level of carbon dioxide in the atmosphere before large scale use of fossil fuels began preindustrial CO2 level.
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