There seems to be growing support for putting a price on carbon to encourage key players in the economy to emit fewer greenhouse gases. This week, the World Bank, along with governments and business leaders, announced a new global initiative: the Carbon Pricing Leadership Coalition. The businesses and governments in this coalition will share experiences working with carbon pricing, which is necessary because it’s not an easy policy measure to implement. Economists have been debating it for decades. The coalition wants to show that there are carbon pricing policies that can maintain competitiveness, create jobs and encourage innovation. Already about 40 nations and 23 cities, states and regions have implemented or are putting a price on carbon, and together they are covering about 12 percent of global greenhouse gas emissions.