1234 Investment performance has always been shadowed by ESG (environmental, social and governance) factors. In line with investment theory, protecting the downside is more important to portfolio returns than the outperformance on a few glory days. ESG may not guarantee happy returns, but it will narrow the opportunity for nasty things popping up in the portfolio and open new doors faster, writes Graham Sinclair, Principal at SinCo - Sustainable Investment Consulting LLC