Stan: Even if there is a global disaster, you can’t store clover like that.

Stan: What if the whole world is covered in water?

Stan: Don’t you have someone else you can annoy?

even if 即使
Even if I fail this time, I would try again. 
即使我這次失敗了，我還要再試試。

disaster n. 災難；災禍；天災
The floods were a disaster.
洪水是一種災害。

what if 如果……將會怎么樣
What if the boy's parents should die? 
如果那男孩的父母死了該怎么辦呢？

cover vt.(常與with連用）蓋；覆蓋
She covered the table with a cloth.
她用一塊布把桌子罩起來。

annoy vt. 使煩惱；使生氣
These flies are annoying me.
這些蒼蠅真讓人討厭。
【參考譯文】
Stan: 即使有全球性的災難，你也不能那樣儲存苜蓿。

Stan: 如果全世界都被水覆蓋了,你怎么辦？

Stan: 你不能去惹惹別人嗎？