Photography was increasingly being seen as something outside the art world. As a sort of illustration. They just fired the director of photography at the Sunday Times Magazine - that's where everyone went with their photo essays in the '60s, '70s, and '80s. It was the place to get published. It is an issue. And I feel it. There's no budget. The budget-holders are very often people who've been to the professional colleges where art is not taught. So art as a part of education is something that's missing - since Thatcher's day, anyway.

Social media's currency is the single photograph. Whereas, every time I look at a photograph, I look at twenty or thirty photographs. I'm looking for a narrative. And that's a different kind of construct. If you're a poet and you put a line from your poem online, "The trees bending over gracefully," or something, you can get a tick. But that has nothing to do with your longer poem.

Good photographs aren't just complex. They are enigmatic. Images are beguiling. And the way they play into our psychology, into our visual cortex, is something we still don't understand.

I was always interested in drawing and painting. I enrolled in college to study painting. But I didn't have any livelihood when I graduated. My mother died very young, and I didn't have any home, so I had to find a way to earn a living. It seemed to me that photography - to the great disappointment, I have to say, of my painting teacher - could offer that. So I went and did a degree in photography, and then after that I could go out and get paid for work. For portraits, things like that.

After my mother died, I lived with relatives. Reading was a means of escaping into other worlds, as photography, much later, was to become.

There was a time, right up until the end of the Second World War and beyond, when white people in Europe thought that they basically owned the world and that everybody else was a sort of servant, or a curiosity, or whatever. And that informed 99 percent of the photographic practice that was done. Without being able to address that, I felt I would have failed in my attempt to explain what the urge to document is.

Environmentalism is a personal thing - but it's also a planetary thing. It's about making deep connections. But it's also about recognizing the very human connection between species diversification and ourselves.