由于人类活动 地球上的树木已经减少一半

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There is good and bad news¹ about trees. The good news is there are seven times more than we thought². Scientists³ thought we had⁴ 400 billion⁵ trees, but we have three trillion. That's a three followed by 12 zeroes⁶. For each person⁷ alive⁸ today, there are 420 trees. A researcher⁹ said¹⁰ these numbers were not good or bad news.

 

The bad news is that we once had six trillion trees. We lost three trillion trees. Europe¹¹ was¹² once a giant¹³ forest¹⁴. Now it is fields¹⁵ and cities. Another 15 billion trees are lost each year. This is a lot more than 100 years ago. The researcher said we must do more to make forests¹⁶ healthy again.

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