The "Per il clima" program offers a voluntary carbon footprint label to inform consumers about the amount of greenhouse gas emissions generated by products or services during one or more phases of their life cycle. The rules for the calculation are defined by a document (PAS 2050) made by the British Standards Institute.

The weight of CO2 on the label may be the result of two different paths: a technical audit and subsequent data processing carried out by a research institute of confidence Legambiente. The weight of CO2 equivalent, in this case is calculated on the entire lifecycle of the product or on one or more phases. The second path is when the data is already available from the company as part of its regulatory compliance. In this case, the weight of CO2 will be referred to the scope and boundaries of space and time required by the regulation.

The 'Per il Clima label' is administered by Legambiente, a well known Environemental Association in Italy with the technical partner Istituto di Ricerche Ambiente Italia.