De or het carsharing?

The correct Dutch article is:

de carsharing

Rule Words ending in -ing: almost always de. See the rule
Meaning (Dutch) samen met anderen één of meer auto's gebruiken; gebuikmaken van een deelauto

How to use carsharing

the carsharingde carsharing
this carsharingdeze carsharing
that carsharingdie carsharing
our carsharingonze carsharing
your carsharingjouw carsharing
every carsharingelke carsharing
which carsharing?welke carsharing?
a big carsharing / the big carsharingeen grote carsharing, de grote carsharing

Meaning, plural, diminutive, pronunciation and translations: WikiWoordenboek (Dutch Wiktionary) (CC BY-SA 4.0). Example sentences: Tatoeba (CC BY 2.0 FR).