Triodos is offering an Ethical Fixed Rate ISA paying 2.1 per cent over two years and 2.3 per cent over three years.
The rate is reasonable but the key point is that your cash is used to finance organisations delivering a positive environmental, social or cultural impact.
There are better rates out there.
The question shouldn't be can you afford to invest ethically, but can you afford not to. The alternative – sticking money in a high street bank – means boosting bankers' bonuses and increasing shareholders' wealth. Invest ethically and you can see exactly how your money is being used at Triodos' website www.knowwhereyourmoneygoes.co.uk