Soil scientists put the date more than 1,000 years earlier, with evidence for anthropogenic modification of soils. (clivehamilton.com)
Anthropogenic modifications of land cover up to 1990. (ipcc.ch)
To understand and predict the response of the climate system to increases of radiatively active gases and aerosols and to compare these predictions to the observed climate record in order to detect the anthropogenic modification of the natural climate signal. (judithcurry.com)