Your investment portfolio will consist of a mix of stocks and bonds. To maximise your impact, you will be the owner of the 30 - 40 companies in your portfolio. Each company in your portfolio counts for about 2 - 3 % of your investment sum. This way, your portfolio is optimally diversified and no position is over exposed. You can find more information about diversification here.
The bonds in your strategy are a Green Bond ETF (Exchange Traded Fund). It contains a mixture of green corporate and government bonds. Thus, this ETF reduces the risk of your investment according to your wishes, and at the same time, has a sustainable impact!