BlackRock CEO Larry Fink's full interview on shifting strategy to focus on sustainability

Larry Fink, founder and CEO of the world's largest asset manager who oversees nearly $7 trillion at BlackRock, announced in his annual letter that BlackRock will make investment decisions with environmental sustainability as its core goal. He sat down with CNBC's Andrew Ross Sorkin to discuss what went through his mind when writing this year's letter and how his clients have reacted to the shift.