If you are not comfortable investing in green bonds, there are plenty of other ways to make a positive impact on the environment with your money. The most straightforward way is to carve out a modest portion of your retirement portfolio and devote it to a proven environmental, social or governance (ESG) fund. Another approach is to divert some of your savings to an environmental-focused not-for-profit organization that inspires you. If your budget is solid and your retirement savings plan is on track, you can afford to make a modest annual charitable contribution.