BlackRock's announcement of its enhanced focus on sustainability was less sweeping than its rhetoric might suggest, but nevertheless was significant. For example, the letter announced, "This year we will begin to offer sustainable versions of our flagship model portfolios," which "will use environmental, social, and governance (ESG)-optimized index exposures in place of traditional market cap-weighted index exposures." [26] Although the existing flagship models will continue to be offered for the time being, BlackRock predicts, "[o]ver time, we expect these sustainability-focused models to become the flagships themselves." [27] BlackRock also declared its intent "to provide transparent, publicly available data on sustainability characteristics – including data on controversial holdings and carbon footprint – for BlackRock mutual funds." [28]