The research report substantiated the impact of climate change with extensive data.

substantiated 是动词 substantiate 的过去式，substantiate 由前缀 sub-（表示"在...之下"）和词根 stant（来自拉丁语 stare，意为"站立"）以及动词后缀 -ate 组成，字面意思是"在...之下建立"，引申为"用事实或证据支持、证实"的意思。