The small minority that is fiercely opposed to wind power, and to renewable energy in general, has its reasons for feeling the way it does. While I regard their views as misguided, I can respect their point of view, so long as it is based on facts and reason.

Following months of speculation, this week the report from the Intergovernmental Panel on Climate Change (IPCC) will set out the latest collective view from the world’s leading climatologists, atmospheric physicists and other experts about the extent of human impact on the Earth’s climate system. Most importantly it will set out possibilities about what might happen in future. That word “might” is key.

We know that nature underpins 100% of economic activity, and that companies large and small are in different ways impacting on it. Sometimes that impact is beneficial, but more often it is leading to the depletion of the very natural systems that sustain businesses.

Mark Tercek: You began your career as an ornithologist and have been an environmental leader for nearly three decades. What are the biggest changes you've seen in the field? What is the environmental movement doing well? What could we be doing differently?