3 sentences

1. 由于过度开发，当地的自然资源已经枯竭。

   yóu​yú guò​dù kāi​fā, dāng​dì de zì​rán zī​yuán yǐ​jīng kū​jié.

   Due to over-exploitation, local natural resources have been exhausted.

   Source: Dong Chinese Dictionary

2. 由于长期的干旱，当地的水源已经濒临枯竭。

   yóu​yú cháng​qī de gān​hàn, dāng​dì de shuǐ​yuán yǐ​jīng bīn​lín kū​jié.

   Due to long-term drought, local water sources are on the verge of drying up.

   Source: Dong Chinese Dictionary

3. 长期的干旱导致这条河流完全枯竭。

   cháng​qī de gān​hàn dǎo​zhì zhè tiáo hé​liú wán​quán kū​jié.

   The long-term drought caused the river to dry up completely.

   Source: Dong Chinese Dictionary