Since there is nothing else going on right now, how about a super volcano blast

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If there weren't enough cataclysms to worry about, a recently published book brought another terrible possibility back into the public spotlight. Among other calamities, Bryan Walsh's "End Times" highlights the eruption of the Yellowstone supervolcano in the United States as an event that could wipe out much of human life on this planet.

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When it does happen, the eruption would propel something like 240 cubic miles of rock, dust and ash into the sky, like it did during the last major explosion. It would also create a flow of magma that would bury the area within a 40-mile radius. Chunks of Colorado, Wyoming and Utah would end up under up to three feet of ash. Parts of the Midwest would be covered in at least a few inches of such ash, becoming dark. And if you think that already doesn't sound good, the emission of dust and toxic gases like sulphur monoxide into the atmosphere would create an acidic veil around the planet reflecting sunlight. This would lead to a dramatic cooling of the global climate that would last at least several years.

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This will also result in devastated crops and the destruction of the power grid. Without sunlight, warmth and food, a major loss of life would be incurred. How bad? As Bryan Walsh writes in his op-ed in the New York Times, a 2015 report for the European Science Foundation on extreme geohazards called what might happen "the greatest catastrophe since the dawn of civilization."

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