“Global Meltdown” (** out of four) was a mediocre disaster-thriller about an environmental scientist (Leeanne Khol Young) and a stubborn survivalist nut (Michael Pare) who lead a group of other survivors to find a safe haven through the wilderness after a cataclysmic event causes the Earth’s crust to fall apart. Umpteenth end-of-the-world movie is strictly for those who’ve never seen “2012′, “Independence Day”, or “The Day After Tomorrow” and special effects are pretty threadbare. Pare’s amusing performance provides some sparks of life.