Earths last hope

The wheat was dying. Vance could see it in the color of the stalks, that pale, washed-out yellow that meant the roots had given up long before the plant did. He stood at the end of row forty-seven inside the Great Greenhouse Delta and watched his crew strip the last viable grain from stems that snapped like dry paper. Nobody spoke. There wasn't much left to say.

Outside the reinforced glass walls, Chicago was grey. The entire skyline sat beneath a permanent haze, a thick biological smog that clung to the rubble of what used to be a city. The Vex had moved through the streets years ago, dissolving parks and parkways, consuming every organic surface until the soil itself turned into a pale, powdery sludge that crumbled underfoot. Nothing grew out there now. Nothing would ever grow out there again.

The perimeter alarm hit like a gunshot.

Three short bursts, then a sustained wail. Vance was already moving before the second cycle finished. He pulled the plasma torch from his utility belt and clicked it live, the blue-white flame throwing sharp shadows across the harvest floor as he ran for the outer filtration corridor.

"Breach on section nine," Corporal Reyes reported over the comm, her voice tight. "The outer glass layer. Commander, it looks like they're eating through it."

Vance ran harder.

Section nine was a forty-meter stretch of the greenhouse's eastern face, and when he pushed through the pressure door and into the filtration corridor, he saw it immediately. The glass was gone in patches, replaced by a creeping, dark growth that pulsed with slow, rhythmic movement. The Vex clung to the frame in thick, vine-like tendrils, their enzyme secretions foaming where they made contact with the synthetic material. The air smelled of rot and chemical burn.

"Torches on the base of the growth first," Vance ordered. "Do not let it reach the inner seal."

His team spread out and engaged. The plasma torches made short work of the outer tendrils, each burst of blue flame collapsing the Vex tissue into ash. For a moment, Vance thought they had it contained. Then Private Hollis stepped too close to a cluster that hadn't been fully cleared, and the Vex responded.

The spray was almost invisible, a fine mist of enzymatic fluid that caught Hollis across the chest and neck. The young man had time to look down. He had time to say one word, a short, clipped curse that was swallowed by the alarm. Then the tissue began to dissolve. It moved fast, far faster than any textbook had described. Hollis dropped to his knees, and within seconds there was almost nothing left of him but the outline of his boots and a spreading stain on the floor.

Vance felt his stomach turn to stone. He kept his eyes forward and his torch moving.

"Seal the corridor," he said. "Now."

They burned the section clean, every last tendril reduced to grey powder. When the alarm finally cut out, the silence it left behind felt heavier than the noise had. Vance stood in the ruined corridor and looked at what remained of Private Hollis, which was almost nothing, and breathed through his nose until his hands stopped shaking.

Dr. Aris Thorne appeared at his elbow so quietly that Vance nearly swung the torch on reflex.

"They consumed the glass," Thorne said. They were already scanning with their bio-reader, wrist moving in quick, precise arcs. "Synthetic silicate composite. They weren't able to do that two months ago." Their voice was flat but their eyes were moving fast, cataloging everything. "The enzyme signature has mutated. The filtration system is no longer a barrier."

"How long before the inner seal fails?" Vance asked.

Thorne looked at him. "Days. Maybe less if they've already adapted to the secondary coating." They hesitated, which was unusual for them. "Vance, the soil readings I pulled this morning. The toxicity levels inside the greenhouse are now past the point of remediation. The root systems have absorbed enough Vex byproduct that even if we eliminated every organism outside, we couldn't grow anything here that wouldn't kill the person who ate it."

Vance looked at the rows of pale wheat behind them, at the crews still working quietly and carefully, and understood that the harvest they were completing right now was the last one. Not the last this season. The last one.

"The soil is dead," he said.

"The soil is dead," Thorne confirmed. They said it the way someone states a fact about weather. Matter-of-fact, almost gentle. "Earth is done feeding us."

The evacuation order came through on his comm unit twenty minutes later. General Soren's voice was clipped, professional, and completely hollow. The Aethelgard would launch from the Chicago anchor pad in seventy-two hours. Commander Elias Vance was to report as mission commander. The colony roster was sealed. The mission parameters were final. There was no room for appeal and no acknowledgment that any of this was extraordinary. It was just orders, delivered in the same tone as a supply requisition.

Vance walked out through the greenhouse's main airlock and stood on the cracked concrete apron outside. The air tasted wrong, thin and chemical, and the sky overhead was the color of old ash. Across the ruin zone, the collapsed towers of what had been downtown Chicago rose out of the grey haze like broken teeth. He had grown up twelve blocks east of where the Willis Tower used to stand. His daughter had loved the lake on clear days. His wife had complained that the winters were too long.

He stared at the skyline for a long time.

Thorne came to stand beside him without being asked, their bio-scanner powered down, hands in their pockets. They didn't say anything, which Vance appreciated.

The wind moved across the dead flats and carried nothing but dust.

"We leave in seventy-two hours," Vance said finally.

"I know," Thorne replied.

He turned his back on Chicago and walked toward the landing pad. He did not look at the skyline again.