ESG has taken a serious foothold in the investing world and continues expanding, with $51.1 billion inflows into some variety of sustainability funds in 2020, a twofold increase over 2019 and 10 times the amount for 2018, reports the Wall Street Journal . Despite its rapid growth, only 2.6% of 401k plans included an ESG option in 2019 according to the Plan Sponsor Council of America.