What's your view on the Climate Change Bill?
It is a step in the right direction, but we're missing an opportunity by failing to embrace annual targets.
Why are these important?
The time we have to avert the most serious effects of climate change is limited - between 10 and 20 years. We think we need the immediacy of annual targets to convey this sense of urgency. The other thing is that governments last only four or five years. If you have five-year targets there are no direct lines of accountability. Governments could say: "That was under the previous administration."
Have you been working with any NGOs?
I have spoken on many platforms as part of Friends of the Earth's Big Ask campaign.
Do you share its position?
Friends of the Earth is being a bit more conservative than we are, because it's calling for 3 per cent targets. We would like to see higher targets. We also support contraction and convergence.
It's where you work out how much carbon is sustainable in the atmosphere and divide that by the global population. It produces a target for every single country on the basis that every human is entitled to a certain quota of carbon.
How will you try to make amendments to the bill?
Through Green Party peer Lord Beaumont of Whitley.