There has been a prolific rise in interest in all things green over the past two years and it should come as no surprise that we are seeing the same rise in enthusiasm when it comes to funds and investments. A recent front-page FTfm article, ( Fears over rush into green funds , September 24) noted concerns about a potential asset price bubble in renewable energy stocks.

With the arrival of a number of new funds aimed at investing in companies that will benefit from climate change this is an appropriate time to consider whether we should be concerned. And what does this mean for the ethical sector as a whole?