instruction:
In this task, you are given a sentence in the Japanese language and your task is to convert it into the English language. In translation, keep numbers as it is and make it sentence case (capitalize only the first word of each sentence and noun).
question:
イラクのウェブサイトのアルカイダに掲げられた声明では、反政府勢力がヘリコプター追撃を行ったと主張する。
answer:
In a statement posted on an Al-Qaeda in Iraq website, insurgents claim responsibility for shooting down the helicopter.


question:
タバコは年間5百万人の寿命を縮めていて、現在の傾向が覆されなければ、数値は2020年までに2倍になる。
answer:
It prematurely ends the lives of 5 million people a year, a figure which will double by 2020 if current trends are not reversed.


question:
科学者は、氷棚が本土から分断されているなら、すでに浮かんでいるので、海面上昇を引き起こすことはない、と述べた。
answer:

Scientists say that the shelf, if it detaches from the mainland, won't cause an increase in sea levels, as it is already floating.