---
title: T
description: Find sustainability terms and eco insights with ecoinvent.org's LCA glossary. Find everything under 'T'.
---

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# T

[TCDD](https://support.ecoinvent.org/glossary-t#T-TCDD)

[TDS](https://support.ecoinvent.org/glossary-t#T-TDS)

[Technosphere](https://support.ecoinvent.org/glossary-t#T-Technosphere)

[TOC](https://support.ecoinvent.org/glossary-t#T-TOC)

[To Environment](https://support.ecoinvent.org/glossary-t#T-To-Environment)

[To Technosphere](https://support.ecoinvent.org/glossary-t#T-To-Technosphere)

[TPM](https://support.ecoinvent.org/glossary-t#T-TPM)

[Transforming Activity](https://support.ecoinvent.org/glossary-t#T-Transforming-Activity)

[Treatment Activity](https://support.ecoinvent.org/glossary-t#T-Treatment-Activity)

[TSS](https://support.ecoinvent.org/glossary-t#T-TSS)

### TCDD

Abbreviation for tetra-chlor-dibenzo-dioxin

### TDS

Abbreviation for Total Dissolved Solids

### Technosphere

Represents all human activities. An exchange of a certain activity can be between the activity and the environment (elementary exchange, for example CO2 emission to air) or between two activities (intermediate exchange, for example wastewater to be released from one activity to another—treatment of wastewater).

### TOC

Abbreviation for Total Organic Carbon

### To Environment

Represents the type (origin) of an exchange. This is an elementary exchange (with the environment) present as an output of an activity.

### To Technosphere

Represents the type (origin) of an exchange. This is an intermediate exchange (with the technosphere) present on the output of an activity.

### TPM

Abbreviation for Total Particulate Matter

### Transforming Activity

A human activity that transforms inputs into outputs that are different from the inputs. This is the most common type of activity in the ecoinvent database, e.g. a hard coal mine that transforms hard coal in ground to the marketable product hard coal, or an automobile plant that turns metals, plastics and energy into cars.

### Treatment Activity

A transforming activity with a reference product with a negative sign, which effectively means that the activity is supplying the service of treating or disposing of the reference product. E.g. the reference product of treatment of waste plastic activity is -1 kg of waste plastic. The name of a treatment activity always start with “treatment of …” phrase.

### TSS

Abbreviation for Total Suspended Solids

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