4 sentences

1. 温室效应导致全球气候变暖。

   wēn​shì xiào​yìng dǎo​zhì quán​qiú qì​hòu biàn nuǎn.

   The greenhouse effect causes global warming.

   Source: Dong Chinese Dictionary

2. 全球气候变暖是一个严峻的挑战。

   quán​qiú qì​hòu biàn nuǎn shì yī gè yán​jùn de tiǎo​zhàn.

   Global warming is a severe challenge.

   Source: Dong Chinese Dictionary

3. 联合国大会正在讨论全球气候问题。

   Lián​hé​guó dà​huì zhèng​zài tǎo​lùn quán​qiú qì​hòu wèn​tí.

   The UN General Assembly is discussing global climate issues.

   Source: Dong Chinese Dictionary

4. 由于全球气候变暖，世界各地的许多冰川正在融化。

   yóu​yú quán​qiú qì​hòu biàn nuǎn, shì​jiè gè​dì de xǔ​duō bīng​chuān zhèng​zài róng​huà.

   Due to global warming, many glaciers around the world are melting.

   Source: Dong Chinese Dictionary