光合作用 | Photosynthesis
2057 年，全球气温比工业革命前高了 3.2°C。人类的自救方案全失败了：碳捕集太贵，植树造林太慢，减排协议没人遵守。
然后有人想起了一个被遗忘的项目。
2021 年，中国科学家在内蒙古沙漠边缘发现了一种能在极端干旱条件下存活的光合细菌。它不需要水，不需要土壤，只需要阳光和空气中的二氧化碳。它的固碳效率是植物的 17 倍。
这个发现被尘封了三十六年——直到 2057 年，一个名叫韩雨的合成生物学家在旧论文数据库里翻到了它。
她用 CRISPR 重写了这种细菌的基因组。不是让它更高效——它已经够高效了。她做的是三件事：让它能在 55°C 以上死亡（防止失控繁殖），让它分泌一种固定沙粒的粘液，让它——最重要的——变得肉眼可见。
不是显微镜下的可见。是卫星图上的可见。
三个月后，第一代”绿潮”在塔克拉玛干沙漠释放。一周之内，两千平方公里的黄色沙漠变成了翠绿色。卫星照片显示，这片区域的二氧化碳浓度以每天 0.03% 的速度下降。
有人欢呼人类得救了。
但韩雨没有欢呼。因为她在基因组的深处发现了一个她没写进去的序列。一个十年前就被另一位科学家——一位已在 2050 年的气候饥荒中死去的人——写好的序列。
那个序列的功能只有一行注释：// 如果气温恢复到工业前水平，自动降解。
这是一个人在三十二年前种下的保险丝。一个他永远看不到结果的决定。
Photosynthesis
- Global temperature: +3.2°C above pre-industrial levels. Carbon capture was too expensive. Tree planting was too slow. Nobody followed the emission agreements.
Then someone remembered a forgotten project.
In 2021, Chinese scientists discovered a photosynthetic bacterium in the Inner Mongolia desert. It needed no water, no soil — just sunlight and atmospheric CO₂. Its carbon fixation efficiency was 17 times that of plants. The discovery gathered dust for 36 years.
Until 2057, when a synthetic biologist named Han Yu found it in an old paper database.
She rewrote its genome with CRISPR. Three changes: die above 55°C (prevent runaway growth), secrete sand-binding mucus, and — most importantly — become visible to satellites.
Three months later, the first “Green Tide” was released in the Taklamakan Desert. Within a week, 2,000 square kilometers of yellow sand turned emerald green. CO₂ concentration above the area dropped 0.03% daily.
The world celebrated.
But Han Yu didn’t. Deep in the genome, she found a sequence she never wrote — planted a decade earlier by another scientist, one who had died in the climate famine of 2050.
The sequence had only one comment: // if temperature returns to pre-industrial level, self-degrade.
A fuse planted thirty-two years ago by a man who would never see it trigger.