為什麼很多人聽力無法提高？
原因可能有：
▪沒有選對材料，聽過難或簡單的聽力材料；
▪沒有刻意訓練，只是不斷聽，沒有糾正自己的錯誤；
▪大多數人都會涉及到的一個問題，堅持不下來。
關注普特的小夥伴們都知道普特君一直開設聽力訓練營來和大家一起堅持練習聽力，那第二季第六期聽力訓練營（21天聽力進階訓練）正式開始啦！前1000名只需39元！
21天聽力持續進階訓練：
▪素材節選自每天更新的VOA慢速、常速和BBC中的30s以內的音頻便於聽寫；
▪每天的課程都有慢速和常速，適合不同等級的學員訓練。
🔻識別二維碼參與課程🔻
Scientists say the world recently set a record for carbon dioxide in the atmosphere.
The record level was reached although industrial activities that produce carbon dioxide have fallen sharply. That is because of efforts to stop the spread of the new coronavirus.
Carbon dioxide is considered the main human-created greenhouse gas: a heat-trapping gas that warms the Earth's atmosphere.
The National Oceanic and Atmospheric Administration (NOAA) said carbon levels averaged 417.1 parts per million for the month of May. That is 2.4 parts per million higher than a year ago. The measurements were taken at Mauna Loa, a volcano in Hawaii.
Emissions of carbon dioxide, from the burning of fossil fuels, dropped by as much 17 percent in April. Fossil fuels include coal, oil and natural gas. However, the decrease did not last a long time.
Pieter Tans is a lead scientist at NOAA. He said carbon dioxide can stay in the atmosphere for hundreds of years. He added that the short-term reductions of carbon gas for a few months did not have much of a long-term effect.
"It illustrates how difficult it is — what a huge job it is — to bring emissions down," Tans said. "We are really committing the Earth to an enormous amount of warming for a very large time."
Records with direct measurements go back to 1958. Scientists say carbon dioxide levels are now nearly 100 parts per million higher than at that time. That is a 31 percent increase in 62 years.
Jonathan Overpeck is head of the School for Environment and Sustainability at the University of Michigan. He told the Associated Press, "The rise in atmospheric carbon dioxide levels is relentless, and this means the costs of climate change to humans and the planet continue to rise relentlessly as well."
Carbon levels in the air were higher long ago before humans, Tans said.
Tans added that carbon dioxide levels reach their highest in May because growing plants begin using more of the gas. That causes carbon amounts in the air to drop.
I'm Jonathan Evans.
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