I think end of movie is where the last 2 survivors are trapped in a mobile research van. They fall out over something and only 1 left. They are trying to stop a world ending event where I think a plant is going to release toxins that ends life on planet. Last sequence being that they fail
is this maybe the same film?
“The Girl with All the Gifts” (2016)
They fight against a fungus released by pods, at the end two of them remain in the mobile lab, one of them leaves the lab and goes outside and dies, the other one remains trapped in the lab. Ultimately they do not manage to save the world from the spreading of the fungus and its consequences.
IMDb page:
https://www.imdb.com/title/tt4547056/
Quotes from the below Wikipedia plot:
”In the near future, humanity has been ravaged by a disease caused by a parasitic fungus”
”Caldwell explains that the growth contains pods which, upon maturity, could release airborne spores that would end humankind.”
”They take shelter in an abandoned mobile laboratory”
”In the lab, Justineau stands inside the sealed door, watching the spores fall.”
”The film ends with a tearful Justineau, safe but confined to the sealed mobile lab due to the lethal spore-filled air.”
Detailed Wikipedia plot summary here:
You can watch the full movie on YouTube here:
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Wow, never thought I’d get that one figured out! Thanks mate, literally made my day 
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