Learn Turkish: Çevre kirliliği arttığından beri büyük seller meydana geliyor. - Since environmental pollution increased, large floods are occurring.

This uses the specific structure for "since doing something". We take the verb root art- (to increase), add the participle -tık, and attach the 3rd person possessive -ı because "pollution" is the subject that increased. Finally, we add the ablative suffix -ndan and the postposition beri (since).

Why does the suffix on the verb start with a "t" (-tığ-) instead of a "d" (-dığ-)?

This happens because of consonant assimilation. The verb root art- ends in a hard, unvoiced consonant (t). As a result, the standard -dık suffix changes to -tık to match. After that, the k softens to ğ because it is followed by a vowel.

Why is the word for pollution kirliliği here instead of just kirlilik?

It is part of a noun compound: çevre kirliliği (environmental pollution). When you pair two nouns to create a new concept and the first one doesn't take a genitive suffix, the second noun must take a possessive suffix. Kirlilik gets the 3rd person suffix -i, causing its final k to soften into a ğ.

What is the literal translation of meydana geliyor?