Climate change is one of the defining challenges of our time, but today we have an historic opportunity to change course. The global carbon pricing revenue in 2021 increased by almost 60 percent from 2020 levels, to around $84 billion, providing an important source of funds to help support a sustainable economic recovery, finance broader fiscal reforms, or invest in communities as part of the low-carbon transition future. Required From the perspective of efficient market hypothesis discuss the merits of fragmented carbon market visa vis integrated carbon market