Vulnerable countries（主语）, such as small island states imperilled by rising seas,（定语） worry （谓语动词）that the findings of a recent un-backed scientific report outlining the dire consequences of another half a degree of warming, on top of the 1°C which has happened since the beginning of the Industrial Revolution, have been underplayed.（宾语从句）

在宾语从句中：

the findings （主语）of a recent un-backed scientific report（定语，修饰the findings） outlining the dire consequences of another half a degree of warming, （定语，修饰report）on top of the 1°C which has happened since the beginning of the Industrial Revolution,（状语） have been underplayed.（谓语）

请问：outlining 在从句中是充当谓语吗？report 在此处应该是名词，为何outlining要用ing 形式?

看上面定语从句的分析，outlining....是现在分词短语，作定语修饰report。意为：概述了.....的报告。

a report outlining the dire consequences of another half a degree of warming： 一份概述了再变暖半度产生可怕后果的报告