The Human Impacts Database

A collection of useful numbers for quantifying the impacts of the human presence on Earth.

This quantity is a single measurement of the quantity at a given point in time (2000 – 2010).


Value:		≈ 1 × 10^-2 kg Nr / Mcal see this value in other units This is equivalent to... ≈ 10 g Nr / Mcal
HuID:		58561
Relevant Year(s):		2000 – 2010
Summary:		Mass of reactive nitrogen deposited as fertilizer needed to grow one megacalorie of wheat. See Fig 2 of source for more information.
Method:		No uncertainty estimate is reported for this quantity and the reported value reflects the estimate given the reported mean fertilizer use and energy density.
Source:		Eshel, G., Shepon, A., Makov, T., Milo, R. Land, irrigation water, greenhouse gas, and reactive nitrogen burdens of meat, eggs, and dairy production in the United States. PNAS (2014)
Dataset:		Resource requirements per Mcal of livestock product and staple crops (eshel2014_fig2_data.csv) global resolution
Original Data License:		PNAS Open Access License
Added By:		gchure