A line of dark red paint, symbolizing blood, led protesters from the Brazilian Consulate to BlackRock's San Francisco office on September 5th. Activists painted a massive street mural in front with the words "Amazon Is Life, BlackRock Kills."

Last Friday, thousands of young people took to the streets in a monumental climate strike, stopping, among other places, at the headquarters of BlackRock. "Help us," they wrote in chalk on the company's steps.

Just this morning, indigenous leaders from Brazil and environmental activists delivered a letter and a petition signed by over 260,000 people to BlackRock's headquarters in New York City while a crowd chanted in the lobby and protested outside.

But what does the world's largest asset manager have to do with the fires raging in Brazil and other parts of the Amazon? In short: a lot.