01
Historical status
Documents are read in the context of their booking and project period at the time.
Documentation · Previous booking periods
This page consolidates information on climate protection measures from previous booking periods for which an individual digital tracking page is no longer available.
Why this page exists
In previous years, project information, confirmations, and decommissioning certificates were provided differently than they are today. Some project pages were not rebuilt during technical relaunches; other projects are no longer part of the current portfolio. Therefore, older links may sometimes no longer lead to an individual project or tracking page.
The original booking and its documentation are not cancelled by this. The documents belonging to the specific booking remain authoritative: project description, standard, quantity, period and – if part of the booking – the documented retirement of the certificate units.
This page provides central access.
It replaces neither the individual booking voucher nor the register entry.
02
Specific assignment
Project, standard, quantity and period belong to the respective booking.
03
Register reference
The issuance and retirement of certified units are verified by registry data.
04
Today's language
Past terms are not a recommendation for current communication.
Stock image – This photograph is for illustrative purposes only and does not show any of the listed climate protection projects.
What still matters
Not the URL that is still accessible today.
Booking
Order or invoice
Allocates customer, period, and booked service.
Project
Project Name and Standard
Identify the supported project and the audit framework of that time.
Units
Quantity, vintage and decommissioning
Document the specific use of certified units, provided they are part of the booking.
How to proceed
Four entries lead back to the project information.
You do not need to reconstruct an old tracking page. Usually, a few details from your documents are sufficient.
01
Search booking number
Please check the invoice, order confirmation, certificate or the email from that time.
02
Identify project
Note down the project name, project number, standard or country – depending on what is specified.
03
Match period and quantity
The reference year, vintage, and the booked or retired quantity should be identifiable separately.
04
Request missing documents
With the information provided, we can check which historical documents can still be made available.
Classification
What this page does – and what it does not
Historical documentation and contemporary environmental statements serve different purposes.
Remains comprehensible
Cannot be automatically derived
which project was part of a previous booking
that the project is still offered today
which standard and period were documented
that a former status continues unchanged
which certificate units have been allocated and retired
a reduction in one's own emissions
which terms were used in documents at the time
the admissibility of these same terms in today's advertising
a financial contribution outside of one's own value chain
Climate neutrality of a product or company
Document types
Not every document answers the same question.
01
Order, invoice or confirmation
These documents describe the contractual service, the customer reference, and often also the quantity, project or booking period.
02
Project information
03
Proof of decommissioning or de-registration
04
Registration and testing documents
Stock image – This photograph is for illustrative purposes only and does not show any of the listed climate protection projects.
Looking for a previous booking?
Send us what you have left.
Useful information includes the booking or invoice number, company name, year, and project name or project number. We will then check which documents can be assigned and in what format they can be provided.
The principle
An old link may disappear. The basis of a booking should not.
This page is for the factual documentation of previous booking periods. For statements regarding a specific booking, only the individually associated documents are authoritative.
General information status: September 2026