When I think about, say, 1995, or whever the last moment was before most of us were on the internet and had mobile phones, it seems like a hundred years ago. ... Time passed in fairly large units, or at least not in milliseconds and constant updates. A few hours wasn't such a long time to go between moments of contact with your work, your people or your trivia.

If gold has been prized because it is the most inert element, changeless and incorruptible, water is prized for the opposite reason -- its fluidity, mobility, changeability that make it a necessity and a metaphor for life itself. To value gold over water is to value economy over ecology, that which can be locked up over that which connects all things.

Perhaps walking is best imagined as an 'indicator species,' to use an ecologist's term. An indicator species signifies the health of an ecosystem, and its endangerment or diminishment can be an early warning sign of systemic trouble. Walking is an indicator species for various kinds of freedom and pleasures: free time, free and alluring space, and unhindered bodies.

The things we want are transformative, and we don’t know or only think we know what is on the other side of that transformation Never to get lost is not to live.

As I started to pursue the subject more deeply I realized that walking was this wonderful meandering path through everything I was already interested in - gender politics, public space and urban life, demonstrations and parades and marches. The relationship between walking and thinking and between the mind and the body.

We are entering an era of heightened disaster, thanks to climate change. Being prepared for disaster will mean being prepared to sift truth from rumour, and being prepared to adjust our worldview.

Perhaps the central question about [Eliot] Porter's work is about the relationship between science, aesthetics, and environmental politics. His brother, the painter and critic Fairfield Porter, wrote in a 1960 review of [Porter's] colour photographs: 'There is no subject and background, every corner is alive,' and this suggests what an ecological aesthetic might look like.