Questions & Answers about Det är nödvändigt att hantera problemet nu.
Why does the adjective nödvändig end in a -t here?
Because the sentence uses the dummy subject Det (It). In Swedish, when you use Det är to state an opinion or evaluation about an action, the adjective must be in its neuter form, which usually means adding a -t.
Is the phrase structure exactly the same as in English here?
Yes! To say 'It is [adjective] to [do something]', Swedish maps perfectly to English: Det är (It is) + nödvändigt (necessary) + att hantera (to handle). This is a very reliable pattern for expressing evaluations.
Can I use hantera anytime I want to say 'handle'?
Hantera works great for dealing with problems, situations, or managing people, much like 'deal with' or 'manage'. But if you mean 'handle' in the sense of physically touching or carrying something, you would use other verbs like ta i or bära.
Just as a refresher, why is it problemet instead of problemen?
Problem is an ett-word. Its singular definite form ('the problem') is problemet. Problemen is the plural definite form ('the problems'). Since we are handling one specific problem here, we use problemet.