Learning Check

This statement appeared in an independent auditor’s report for a sustainability report:

“We believe that our work provides an appropriate basis for us to conclude with a limited level of assurance on the subject matter.  In such an engagement, less assurance is obtained than would be the case had an audit-level engagement been performed.  In conclusion, in all material respects, nothing has come to our attention that causes us not to be believe that…”

What type of assurance was completed?  What was limited in the engagement?