Learn Italian: Essendo la mancanza di fondi evidente, c'è la necessità di risparmiare. - The lack of funds being obvious, there is a necessity to save.

A normal gerund shares its subject with the main clause. An "absolute" gerund is independent because it has its own explicit subject. Here, the subject of the gerund is la mancanza di fondi (the lack of funds), which is completely different from the subject of the main clause, la necessità (the necessity).

Why is the subject placed after the gerund (Essendo la mancanza...) instead of before it?

In Italian absolute gerund clauses, the explicit subject almost always follows the gerund. Saying La mancanza di fondi essendo evidente sounds very unnatural to Italian ears, even though it matches the English word order.

Does this absolute gerund express time, cause, or a condition?

Here, it expresses a cause. The absolute gerund is often used in formal writing to show cause-and-effect. In everyday speech, you would more likely use a regular conjugated verb with a phrase like dato che (given that): Dato che la mancanza di fondi è evidente, c'è la necessità di risparmiare.

Why do we use the preposition di in necessità di risparmiare?

This is a quick refresher from earlier levels: when an abstract noun expresses a need, desire, or fear, it usually connects to a following infinitive verb using the preposition di. Just as you say il bisogno di mangiare (the need to eat), you say la necessità di risparmiare (the necessity to save).