Guardian: The garish gunk coursing through a greenhouse filled with transparent pipes appears to belong on the set of a particularly slimy episode of Star Trek. Multiplying rapidly as it flows through tubes, stacked 14 high in four long rows, the organism thickens and darkens like the bioweapon of a deranged scientist. But this is not a science fiction horror story, it is one of humankind’s most ambitious attempts to recruit algae in the fight against climate change. Developed by …