An index fund is a portfolio of assets that tracks a market index such as the S&P 500. This index measures the performance of the 500 largest US companies. ETFs, or exchange traded funds, are bundles that contain assets and can be traded every day just like stocks. Bundling can reduce your risk. Bundling can help you avoid big losses if one stock drops. However, it is possible to have other stocks that are doing well. These stocks also have the advantage of being cheap and having low fees.Green bonds, or funds that combine green bonds together, might be worth considering. Bonds are considered lower-risk investments, so they may have lower returns. Bonds have a predictable, fixed rate of return. The money that flows into green bonds is used to fund environmental projects all over the globe.