Io by Netflix (2019)

A storm creates a toxic cloud that passes through Sam's shelter, killing all of her bees. Micah, a man travelling by helium balloon, arrives shortly thereafter. He intends to reach the launch site and leave Earth, but first wants to speak with Dr. Harry Walden, Sam's father, who had urged mankind to stay because he still saw hope.
Initially, Sam states that her father is conducting field work elsewhere. However, after a day, she reveals that her father died the previous year. Hearing this, Micah is determined to take Sam with him to the space shuttle, to which she apathetically agrees. After receiving a message from her boyfriend saying goodbye, because he is part of an expedition embarking on a 10-year voyage to an exoplanet orbiting Alpha Centauri, Sam records a message informing everyone still on Earth that Dr. Walden's attempt to clean the planet was ultimately unsuccessful and that everybody should leave to Io.
While preparing and waiting for the right wind conditions, Sam and Micah grow closer and become romantically involved. They also discover that a new queen bee hatched in Sam's hive, which is immune to the toxic air. They are informed that the shuttle launch is rescheduled to another site, farther away than the original. As a result, they drive into a city blanketed by the toxic atmosphere to obtain the helium required for the journey. After finding the helium, Sam visits an art museum alone. Micah rushes after her, knowing her oxygen tank is running low. Instead of switching to a new tank, Sam pulls off her mask and breathes the toxic air hoping to survive. She takes several breaths, as the scene fades to black. Micah travels alone to the spaceship because Sam has decided to stay behind. The changed environment is not toxic to her the same way it was not toxic for the queen bee in her bee colony, hinting that those born in the environment can live in it.
The film ends with Sam standing on a beach alone before being joined by a young child. A voice over of a letter from Sam to Micah tells how beautiful the Earth is, how those who have left the planet will have learned to fear it, and that they are waiting for them to return.