The report concludes that climate change is a global issue.

concludes 是动词 conclude 的第三人称单数现在时形式。conclude 由前缀 con-（表示"完全"）和词根 clude（来自拉丁语 claudere，意为"关闭"）组成，字面意思是"完全关闭"，引申为"得出结论""作出总结"的意思。