I see several trends lining up, enabling Impact Investing to become a founding aspect on most investment portfolios and allocation frameworks.
Traditional assets and their conditional correlations are increasingly converting.
Society in general and sophisticated Investors specifically, are increasingly recognizing that Social Responsibility is not only public Sector issue
Impact Investing has the potential to produce attractive and non-correlated returns.
Have a look at the paper from Bridges Ventures on how to approach Impact Investing, and how it may be integrated into your Allocation framework.