The article discusses the challenges in sustainable investment strategies, particularly the issue of over-concentration in specific sectors leading to significant drawdowns during market volatility. It emphasizes the importance of proper diversification across the entire sustainable universe to achieve long-term returns and stability. While acknowledging the importance of clean energy sectors like solar power and electric vehicles in achieving global climate goals, the article highlights the risks of overexposure in these areas due to factors like increasing rates and competition. By diversifying into uncorrelated areas such as energy efficiency and biodiversity restoration, investors can benefit from downside protection. The article also stresses the significance of focusing on quality companies with strong fundamentals, experienced leadership, and competitive advantages to ensure sustainable and stable returns. While acknowledging the potential of emerging sectors like hydrogen and other innovative technologies, the article recommends a cautious approach and emphasizes bottom-up analysis to identify the most promising stocks. Finally, the article concludes by highlighting the potential of stocks addressing environmental challenges as long-term investment opportunities, advocating for a balanced approach that combines diversification and quality selection to mitigate volatility.