What’s going on with the Greenland ice sheet? It's losing ice faster than forecast and now irreversibly committed to at least 10 inches of sea level rise

I’m standing at the edge of the Greenland ice sheet, mesmerized by a mind-blowing scene of natural destruction. A milewide section of glacier front has fractured and is collapsing into the ocean, calving an immense iceberg.

Seracs, giant columns of ice the height of three-story houses, are being tossed around like dice. And the previously submerged portion of this immense block of glacier ice just breached the ocean – a frothing maelstrom flinging ice cubes of several tons high into the air. The resulting tsunami inundates all in its path as it radiates from the glacier’s calving front.

Fortunately, I’m watching from a clifftop a couple of miles away. But even here, I can feel the seismic shocks through the ground.