In focus

How does carbon dioxide raise temperatures on the Earth?

作者：21ST

Carbon dioxide accounts for most (more than 70 percent) of the greenhouse gases in the atmosphere. The Earth warms up when it absorbs sunlight and turns it into heat. Much of this heat eventually ...

点击阅读全文

对本期电子报订户、有效期内的VIP教师会员和本学期二十一世纪英文报尊享卡用户，我们开放所有内容：
如果您拥有以上权限，请点这里登录；
订阅电子报，请点这里；
激活VIP教师卡，请点这里；
激活21英语尊享卡，请点这里。