VOA标准英语2008年-New Study Reveals Australian Trees Are Giant Ca

Australia's vast native forests are storing three times as much carbon as previously¹ thought and could hold the key to tackling climate change, according to a new study released Tuesday. It has found the eucalyptus² forests of southeast Australia can harness billions of metric tons of greenhouse gases and the clearing of such forests threatens to significantly increase the amount of greenhouse gases in the atmosphere. From Sydney, Phil Mercer reports.
　
Eucalyptus trees in southern Australia (file photo)

After a decade of research analyzing³ hundreds of sites across the country, scientists have for the first time calculated the importance of natural forests in Australia's fight
against climate change.

They have discovered that the forests can store three times more carbon than previously thought - on average about 640 tons per hectare.

It is estimated that large trees are giant carbon sponges and can store vast amounts of carbon dioxide, the principle greenhouse gas that many researchers believe is the main
cause of global warming.

Trees consume and store carbon dioxide as they grow, which is released into the atmosphere if they are chopped down.

Brendan Mackey is a professor of environmental science at the Australian National University says natural forests are extremely valuable environmental assets.

"We looked at half of Australia's remaining forests and our estimate is that they can store around 33 billion tons of carbon dioxide," Mackey said. "These are very big numbers I know.

If all those forests were to be cleared and all of the carbon in the biomass in the soil were to be released into the atmosphere - that would be the equivalent of about 80 percent of Australia's annual greenhouse gas emissions⁴ every year for 100 years. So we really have to protect our natural forests."

Australian researchers believe international decision-makers should pay closer attention to the value of native forests in combating climate change. They have insisted that deforestation around the world has created the same amount of greenhouse pollution as transport.

About half of Australia's forests have been cleared in the past 200 years since the arrival of European settlers.

Scientists have warned that what is left should be protected to allow trees and forests to absorb excess carbon dioxide in the atmosphere and do their bit to tackle climate
change.

Environmental groups have welcomed the latest research and have called on the Australian government to do more to protect the continent's remaining woodlands and forests.

Australia is one of the world's worst per capital emitters of greenhouses gases. Global warming has become a key point of political discussion, although some Australian scientists and farmers believe a changing climate is not due to man's excess but simply the result of shifting natural cycles.

　

1 previously   

adv.以前，先前（地）

参考例句：

• The bicycle tyre blew out at a previously damaged point.自行车胎在以前损坏过的地方又爆开了。
• Let me digress for a moment and explain what had happened previously.让我岔开一会儿，解释原先发生了什么。

2 eucalyptus   

n.桉树，桉属植物

参考例句：

• Eucalyptus oil is good for easing muscular aches and pains.桉树油可以很好地缓解肌肉的疼痛。
• The birds rustled in the eucalyptus trees.鸟在桉树弄出沙沙的响声。

3 analyzing   

v.分析；分析( analyze的现在分词 )；分解；解释；对…进行心理分析n.分析

参考例句：

• Analyzing the date of some socialist countries presents even greater problem s. 分析某些社会主义国家的统计数据，暴露出的问题甚至更大。 来自辞典例句
• He undoubtedly was not far off the mark in analyzing its predictions. 当然，他对其预测所作的分析倒也八九不离十。 来自辞典例句

4 emissions   

排放物( emission的名词复数 )； 散发物（尤指气体）

参考例句：

• Most scientists accept that climate change is linked to carbon emissions. 大多数科学家都相信气候变化与排放的含碳气体有关。
• Dangerous emissions radiate from plutonium. 危险的辐射物从钚放散出来。