Impersonal expressions of the type "es + adjective + que" are almost always followed by a verb in the subjunctive mood. This is because such expressions usually indicate either a value judgment or a desire.
Some examples:
- Es importante que estemos en la misma página. It is important that we be on the same page.
- Es sorprendente que nadie haya ido a la cárcel. It's surprising no one has gone to jail.
- No es bueno que el hombre esté sólo. It is not good for the man to be alone.
- Es posible que algunos sitios web no se muestren o funcionen correctamente en ese navegador. It's possible that some websites don't display or function properly in that browser.
- Es necesario que cierren las escuelas. It's necessary for them to close the schools.
- Es prohibido que la familia anfitriona aloje otros estudiantes. The host family is prohibited from lodging other students.
- Es interesante que el equipo gane. It's interesting that the team is winning.
- Es natural que yo esté enamorado de ti. It's natural that I'm in love with you.
- Era urgente que llegara a la ciudad. It was urgent for him to arrive at the city.
- Será preciso que vayas a la reunión a explicar las cosas. It will be necessary for you to go to the meeting to explain things.
- No me interesa que el equipo gane. It doesn't interest me that the team is winning.
- Importa que la familia reciba el dinero. It is important that the family receive the money.
- Es obvio que estoy preocupado. It's obvious I'm worried.
- Es cierto que la familia está en crisis. It is certain that the family is in crisis.

