这里的come是系动词,相当天be动词或become,
come link-v.成为、变为、变得.
you are so interested in the environment是省略了that的表语从句.
how come 后面直接加表语从句（不用倒装）,表达一种语气：愤怒或惊讶.美口语
how come ：怎么会（是）.…（这样）,这是美式英语口语的固定搭配.
How come you are so interested in the environment?
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