Siberia's forests are logged at an incredible rate.

该句为现在进行时的被动语态。意为“西伯利亚的森林正在以惊人的速度被砍伐。”

去掉 being 也可以，那是一般现在时的被动语态，意思就变了。

are being logged 是“正在被砍伐”。

are logged 是“经常被砍伐”。（该森林被砍伐是常态）

看来，网友需要好好学习一下被动语态的基本知识了。

现在进行时的被动语态：am/is/are + being + 过去分词

The thief is being questioned in the next room. 那个小偷正在隔壁房间接受审问。

Is the car accident being looked into now? 那起交通事故正在被调查吗？

过去进行时的被动语态：was/were+being + 过去分词

When I called,tea was being served. 当我打电话时，正值上茶之际。

The Children's Palace was being built last month.I'm not sure if it is completed now. 那座少年宫上个月还在修建。我不知道现在完成了没有。