it kindf grew up along with the green movement tthrough the 1970s and it kind ofhen grew to incorporateremovaemoval of firearmmanufacturersf nuclear weapon manufacturers. it wasll about excluding companies. >> this exclusion strategy is called divesting, and despite the initial excitement, it led to mixed results. hauke hillebrandt: it is, however, according to modelittle b.lio theory, you have to sacrifice some financial returns. >> destments removed entire sectors like energand tobacco investors' portfolios. when a portfolio is less diversied, its risk goes up. the first of such funds, for example, has historically underperformed the market. but big money is now betting thathis willhange. inis 2020 leer to ceos larry nk, the chairman of blackrock, the world's largest fund manager, came right out and said climate risk is investment risk. main: i don't think there is a choice between plan and profit. when you look at some of the esg wasti resourc part oft eth-- it d the boom line.?are y? well, th brings stight back i. >> screeng compaes for e critia has pven an fective y to antipate an avoid