这个里面的引导词不是which，而是with which ，先行词是speed，是一个定语从句。
nothing has ever equaled the magnitude and speed这是主句
human species is altering the physical and chemical world.是从句
with which 是引导词
human species is altering the physical and chemical world with the speed还原到从句就是这样滴
介词+关系代词=关系副词
这是定语从句引导词的一种规则
比如：
“in、on、at 、to+which=where"
"for which=why"
"on\in\at\during+which=when"
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