The Leftovers has become one of the most ambitious, critically acclaimed shows on television, so why hasn't HBO renewed it for a third season?

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The season 2 finale of The Leftovers airs this Sunday on HBO and there is still no indication that it will return next year. With such an uncertain fate between renewal and cancellation, many Leftovers fans are growing nervous about a potential end in sight sooner rather than later.

One reason for the possible lack of renewal is the ratings. Season 2 has been a far cry from season 1 in the ratings department, with no episode able to climb above 1 million viewers. Conversely, the lowest viewership for season 1 was 1.38 million. While season 2 ratings have gone up a bit over the course of the fall, it is still an alarming statistic.

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Some may blame the timeslot for its big drop in viewership. Season 1 aired after the final season of True Blood, which was always a ratings smash for HBO. Meanwhile, season 2 does not have a proper lead-in and is up against major cable dramas like AMC's The Walking Dead and Showtime's Homeland.

There is also the potential that many viewers simply gave up on the series after season 1. The Metacritic score for season 1 was 65 out of 100, suggesting mixed reactions overall. This may have led to many viewers finding other series to watch, all the while season 2 has had widespread critical acclaim.

Many fans of The Leftovers have taken to Twitter to voice their support of a renewal. Check out a few of the more fevered tweets below:

The Leftovers airs Sundays at 9 p.m. ET/PT on HBO. The series is also available on HBO Go and HBO NOW.