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 (2021).


Value:		≈ -150 - -100 kg N /t see this value in other units This is equivalent to... ≈ -0.15 - -0.1 kg N /kg
HuID:		23066
Relevant Year(s):		2021
Summary:		The amount of nitrogen emissions from farmed bivalves. Bivalves are not fed and instead remove nitrogen from the waters, resulting in a negative value for nitrogen emissions.
Method:		This value comes from a compilation of life cycle analysis studies. They used hierarchical Bayesian modeling to estimate both off-farm and on-farm stressors at the species level and used global production values to obtain means for taxonomic groups. The upper and lower bounds reported represent 50% of the width of the distribution of the parameter obtained from Bayesian modeling.
Source:		Gephart, J.A., et al. Environmental performance of blue foods. Nature (2021)
Dataset:		Estimated environmental stressors for various aquatic foods (Gephart2021_fig_1_data.csv) global resolution
Original Data License:		No Stated Copyright - Contact authors directly
Added By:		rbanks