1. (A friend will leave for a few days, but will be back next week)

-- I will be back next week.

(Traditional) 我 下週 回來。

(Simplified)  我 下周 回来。

-- Have a good trip!

(Traditional/Simplified) 祝你 旅途 愉快！

2.

Climate change threatens world's food supply, alarming UN report says. 

(Traditional) 聯合國 報告 警告，氣候 變化 威脅 世界 糧食 供應。

(Simplified)  联合国 报告 警告，气候 变化 威胁 世界 粮食 供应。 

* food 食物