DEREK Miller (Letters, August 23) points out the contradiction of aiming for a greener future while trying to squeeze every last drop of fossil fuel from the North Sea, and asks on this basis how the Scottish Greens can support the SNP.

Quite simply we don't, and that's why we are different political parties.

I would not support any party which was unwilling to acknowledge the reality that Alan Sangster (Letters, August 23) points out; that the world has far more fossil fuels than we can afford to burn if we're remotely serious about the climate change commitments all parties have signed up to.

So if the referendum was a choice between supporting the SNP whose government in Edinburgh still backs the fossil fuel industry, or supporting the three UK political parties whose governments in London back the very same fossil fuel industry, the Greens might throw up our hands and wish a plague on all their houses.

Of course the referendum is not a choice between political parties. Greens have long debated indepen­dence on our own terms (sometimes disagreeing but doing so in a spirit of friendship, something we should all aim for over the coming weeks and beyond) and overwhelm­ingly we see more opportunity than risk.

Crucially, I believe that an indepen­dent Scotland would be forced to face the urgency of ending its reliance on an overvalued fossil fuel industry, and would have the political ability not only to harness our huge renewable potential, but also to reduce demand to sustainable levels and invest the proceeds of the industry for the common good.

If I thought for a moment that the UK Government was about to embrace this agenda, I might even be on the other side of the debate. But the briefest look at its track record tells me that we must take responsi­bility ourselves. That doesn't mean voting SNP. It means voting Yes.

Patrick Harvie MSP,

Room MG.05, Scottish Parliament, Edinburgh.