De or het veldverwarming?

The correct Dutch article is:

de veldverwarming

Rule Words ending in -ing: almost always de. See the rule

How to use veldverwarming

the veldverwarmingde veldverwarming
this veldverwarmingdeze veldverwarming
that veldverwarmingdie veldverwarming
our veldverwarmingonze veldverwarming
your veldverwarmingjouw veldverwarming
every veldverwarmingelke veldverwarming
which veldverwarming?welke veldverwarming?
a big veldverwarming / the big veldverwarmingeen grote veldverwarming, de grote veldverwarming