Flawed storyline with so many unanswered questions

Rating: 5/10 (16 July 2018)

While I appreciate the well-meaning and important message behind 'Children of Men', its on-screen execution is extremely disappointing. This might be a sci-fi film but, given it's supposed to be portraying a real life scenario in the near future, the storyline should at the very least have some substance and believability to it. Unfortunately I couldn't buy into any of what was happening and it never really had me fully engaged.
The problem is that nothing in 'Children of Men' is ever explained, including the most crucial part of the plot - why have women become infertile? We are just expected to go along with everything that happens without questioning why or how. The film becomes more and more implausible as it goes along, with an ending that is rather appropriately uninspiring and far-fetched. On a side note, if this film is supposed to be set 20 years in the future, why does everything from the cars to the TVs look exactly the same as in 2006?