[Drill Thrawl]

•On highways, by lining them with giant synthetic trees (which use chemical processes to suck CO₂ out of the air).

Um, I thought that's what real trees do.

[SpinnerWebb]

These would be special trees, costing thousands of times more than a natural tree... but they would be able to suck fractions of a percentage more carbon from the air than their natural counterparts.