Machine that Saved the World

What if the inhabitants of Earth received a message from the future warning of an upcoming calamity that could wipe out the entire planet? That's the plot that propels "e;The Machine that Saved the World"e; by prolific SF luminary Murray Leinster. When the denizens of the future propose a solution, however, one man harbors suspicions. Is he merely paranoid, or are his misgivings well found...