VERIFY: Did mural of Greta Thunberg require 700 cans or 700 gallons of spray paint to create?

People are tweeting out a claim, reported by The Blaze and The Daily Wire, that a muralist paid homage to an environmental champion by going through aerosol cans.
Published: 9:17 PM EST December 12, 2019
Updated: 9:16 PM EST December 12, 2019