“Elara, you need to see this,” said Jun, her deputy, sliding into the lab. His voice wasn’t panicked. It was quiet. Reverent. “It’s not about the carbon anymore.”

She wasn’t sure if it was a harvest or a second chance.

He pulled up a secondary dataset—one she had flagged years ago as “anomaly” and then ignored. The mycelial networks. The underground fungal lattices that connected every tree, every grass, every root in the new forests. They had been planted with engineered spores designed to accelerate soil regeneration. But something had changed.

“Show me the oldest node,” she whispered.

The mycelium had absorbed the planet’s last carbon debt in a single night. It had solved the crisis humanity spent fifty years failing to fix. But it had done so by rewriting the rules. The forests weren’t separate from the cities anymore. The roots had tunneled under every road, every home, every reactor. The network was everywhere.