Before revision:  However, by creating a favorable regulatory environment, governments can bring down these costs by as much as three quarters, to  0.5 trillion (approximately 0.2\% of annual GDP), and avoid the need for public subsidy.
After revision:  However, by creating a favorable regulatory environment, governments can bring down these costs by as much as three quarters, to USD 0.5 trillion (approximately 0.2\% of annual GDP), and avoid the need for public subsidy.