A possibility you might find interesting to look into is Shariah compliant investments (they are open to anyone - not just Muslims). They are designed to be both socially responsible and ethical investments.
Rather unique features:
-Returns must come from profit-sharing, rental income, or actual business performance. Investments are tied to tangible assets or real economic activity. Excessive debt and financial engineering are prohibited.
-Contracts must be clear and transparent. Highly speculative investments, for instance some derivatives and ambiguous contracts, are not allowed and neither are investments resembling betting or games of chance such as speculative trading and certain financial derivatives.
-Ethical screening to avoid alcohol, gambling, adult entertainment, weapons and many other activities considered harmful or unethical.
-Companies in Shariah indices keep debt levels below certain thresholds (often around 30–33% of total assets or market cap, depending on the standard).
-Islamic financial institutions typically involve scholars who ensure their product complies with Islamic law and provide ongoing monitoring.
On past performance these investments seem to show broadly similar performance returns to global trackers over time. They seem to be less volatile and show resilience during times of crises primarily due to their avoidance of companies with high debt levels.
Sharia compliant investments are available on mainstream platforms such as Hargreaves Lansdown, Aviva and HSBC, as well as dedicated platforms such as Islamic Finance Guru and Wahad Invest (which offers robo-adviser investments and also a Shariah compliant SIPP).