# ECOTELOS > An instrument for the ecologically responsible use of AI. It accounts for what one answer from a machine costs the world in energy, carbon and water, grades each model from A to G against a published anchor, and states what it cannot count. Part of AGNT ECO. The front page is the explanation, in three parts, and every figure on it is computed when the page loads. ## Part I: what we are measuring - [What ecological means](https://telos.agnt.eco/#ecological) - [No exit from thermodynamics](https://telos.agnt.eco/#thermo) - [Efficiency is not sufficiency](https://telos.agnt.eco/#sufficiency) - [You cannot measure a model](https://telos.agnt.eco/#notamodel) ## Part II: the instrument - [In, and out](https://telos.agnt.eco/#receipt) - [The label](https://telos.agnt.eco/#label) - [One number, and its weights](https://telos.agnt.eco/#weights) - [Two axes, not one](https://telos.agnt.eco/#axes) ## Part III: the data, and the calculation - [What we hold](https://telos.agnt.eco/#hold) - [Where a size comes from](https://telos.agnt.eco/#size) - [The calculation, worked](https://telos.agnt.eco/#worked) - [The grade, and its anchor](https://telos.agnt.eco/#grade) - [What the ratio shows](https://telos.agnt.eco/#efficiency) - [Local is private, not clean](https://telos.agnt.eco/#local) - [What we do not count](https://telos.agnt.eco/#defects) ## Papers - [ECOTELOS: an instrument for the ecologically responsible use of AI (Zenodo, v1.0.0)](https://doi.org/10.5281/zenodo.22903481) ## Optional - [AGNT ECO network map](https://agnt.eco/llms.txt)