The use of tobacco, which is highly addictive, killed approximately 100 million people in the twentieth century, and unless we act, it could kill up to a billion in this century.

烟草很容易使人上瘾，烟草的使用在二十世纪导致了约一亿人死亡。如果我们不采取行动，它在本世纪可能造成多达十亿人丧生。

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An object big enough to kill off a substantial portion of the earth's population only hits earth about twice every million years.

一个足够大的天体只要它平均每100万年撞击地球两次就足以摧毁一大部分地球上的人口。

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Myocardial infarctions, hypertension, cerebrovascular events, and heart failure kill over 7.5 million people a year.5.

心肌梗死，高血压，脑血管事件和心衰每年夺走超过七百五十万人的生命(5)。

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Studies have found handwashing to cut risk of diseases like diarrhea and pneumonia by half, which otherwise kill a combined two million children a year.

FORBES: Can The Private Sector Drive Meaningful Social Progress? The Case of Global Handwashing Day

Smoking is estimated to kill more than one million Chinese a year.

CNN: China clouded in cigarette smoke

By contrast, humans kill around 100 million sharks every year - a number that has ballooned in recent years because of the enormous demand for shark fins to make shark fin soup.

CNN: Shark fin soup alters an ecosystem