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1. It is a rapid increase compared to most natural changes.

1．vt. 比较；对照。如：

Compare your answers with those at the back of the book to see if they are right.

把你的答案同书后面的答案对照一下，看看是否正确。

My handwriting can not be compared with my father's.

我的书法不能与我父亲的相比。

2．vt. 喻为；比拟。如：

Man's life is often compared do a candle.

人生常被比为蜡烛。

Shakespeare compared the world to a stage.

莎士比亚把人世比做舞台。

compare...with...表示"把......与......相比（同类相比）"

compare...to... 表示"把......比做......（异类相比，比喻）"

compared to /with 与......相比, 只能作状语

2.How has this come about and does it matter?

come about : 发生，造成 相当于happen

When Mother woke up, she didn't know what had come about.

I'll never understand how it came about that you were late three times a week.

Do you know how the air accident came about?