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:		(0.175 ± 0.025) kg Nr / Mcal see this value in other units This is equivalent to... 175 ± 25 g Nr / Mcal
HuID:		39532
Relevant Year(s):		2000 – 2010
Summary:		Mass of reactive nitrogen deposited as fertilizer needed to rear one megacalorie of beef. See Fig 2 of source for more information.
Method:		Reported uncertainty is the standard deviation of the quantity given annually-averaged data over the years 2000 — 2010. The reported value was calculated using formal error propagation techniques given the reported uncertainties of the individual datasets. These uncertainties are in moderate agreement with those estimated using Monte Carlo based bootstrapping estimates.
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