The towers crumblin
Burnin sour for hours wondering
Why the powers of dollar bill been plummeting?

from DProsper – MERKABA REVISITED Lyrics on Rap Genius

Meaning

The World Trade Center collapse in New York City. Toxic black smoke covers the city for months. Also the crash of the American economy, creating the recession.

Note: Burning Sour diesel
http://en.wikipedia.org/wiki/Sour_Diesel_%28cannabis%29

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