If sequels are difficult to pull off, then the rare disaster movie sequel is that much harder. Disaster movies tend to ask a lot of their audiences, particularly when it comes to suspending disbelief.
Greenland didn't do that to the extent of Geostorm, but even the Gity family survival in the first movie requires viewers to be a bit forgiving. Greenland 2: Migration manages to remain on par with the amount of grace required of its audience, a feat in and of itself.
The sequel picks up several years after Greenland ends. Although the final scene of that movie suggests the survivors are well on their way to building a new Earth, Greenland 2 begins on much more dire footing. The Gity family remains in their bunker, as do all who made it to the Greenland safe haven. In addition to the air being lethally toxic, the planet is plagued by a host of storms as well as comet fragments continuing to crash land.
What's more, humanity is far from coming out of this devastation with a renewed sense of unity. War, violence, and a global scarcity mindset make other people as deadly as the weather events themselves. Perhaps the biggest pleasant surprise is the fact that the stakes continue to feel high. The movie is less about shock factor and more about the realities of humanity and how dark an era this would realistically be.
In that way, Greenland 2 feels more akin to The Last of Us than it does many disaster blockbusters. Yes, comet fragments rain down from the sky, but there are also gritty scenes involving shootouts and depictions of humans at their very worst, willing to kill if it means saving their own skin.
One of the things that set Greenland apart was how granular the focus on the Gity family was. Greenland 2 strikes the same balance with Jon, Allison, and Nathan's survival, feeling just as integral to the plot as the geology. Greenland 2 considers finer details, such as the government bringing more therapists than surgeons into the bunkers because they knew how traumatizing these events would be. Gerard Butler in a therapist's office isn't what one might expect from a disaster movie, but it lays the groundwork for where the movie ultimately lands.
Not only does it avoid death solely for death's sake, a common pitfall, but it also has an actual message to deliver, all without feeling hamfisted. While not exactly revolutionary, the fact that the movie achieves that depth alongside its death-defying moments should be applauded.
Greenland 2 wasn't flawless. There were details that had to be overlooked, particularly when it came to the Gity family's ability to get help from strangers when the movie went to great lengths to show an everyman for himself mentality.
There's also the problem of Nathan's insulin, which only feels like a gap because it was such a major element of the first movie. Given that Greenland highlighted the government's rejection of anyone with a chronic condition, it's a little odd that they had enough insulin stockpile to provide it for several years. The titular migration also avoids focusing on Nathan needing his insulin.
Even these gaps can be forgiven, however, as it's easy enough to imagine that the government would have hoarded as many resources as possible. All things considered, these grievances are trivial, and Greenland 2 manages to put itself in a league of its own, proving that exploration of what's next can be just as good as what came before.