声音简介
[00:52.21]To get a better understanding of global warming,
[00:55.09]it is important to understand the greenhouse effect.
[00:59.56]The greenhouse effect is the rise in the temperature
[01:03.33]caused by absorption of the Sun's heat
[01:05.88]and light by the Earth's surface
[01:07.96]which then is reflected back
[01:09.90]and trapped within the Earth's atmosphere.
[01:13.13]The greenhouses gases, help to keep the Earth warm,
[01:16.57]and this is the reason why life on Earth has existed,
[01:19.87]and still thrives.
[01:22.44]However, with an increase in the gases
[01:25.29]like carbon dioxide, ozone,
[01:27.94]Earth has gotten nearly 14% hotter
[01:31.93]than what it used to be 50 years ago.
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