In this week’s readers’ Q&A session, Ian Simm, chief executive of Impax Asset Management, answers your questions.

Below, he discusses impediments to biofuels, EU support for Chinese renewables and gas’ future as a clean energy source.

Next in the hotseat is James Cameron, vice chairman of Climate Change Capital. He will be answering your questions next Friday, February 4th. Send in your questions for consideration by the end of Sunday, January 30th to energysource@ft.com.

But for now, over to Ian: