into a real drama, so really feel that that particular plant is hell—bent on strangling some other plant, which they often are, of course. so it's quite vicious, the world of plants? plants can be very vicious. any gardener will tell you that — that there is a war going on out there in the herbaceous border. and the attenborough message is that plants are more than something interesting to look at — they are vital for the climate, and they are the foundation for all life on earth. the world depends upon plants and we treat them with so little thought and so little care — and exterminate them without little thought or care. and we will pay the price. i have been reporting on climate change, climate science, for nearly 20 years and i have seen some spectacular advances in understanding in that time. what most strikes you about the changes you have seen?