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.

Space--as landscape, terrain, spectacle, experience--has vanished.

As for me, the grounds of my hope have always been that history is wilder than our imagination of it and that the unexpected shows up far more regularly than we ever dream.

A restlessness has seized hold of many of us, a sense that we should be doing something else, no matter what we are doing, or doing at least two things at once, or going to check some other medium. It's an anxiety about keeping up, about not being left out or getting behind.

You write your books. You scatter your seeds. Rats might eat them, or they might rot. In California, some seeds lie dormant for decades because they only germinate after fire, and sometimes the burned landscape blooms most lavishly.

The fight for free space-for wilderness and for public space-must be accompanied by a fight for free time to spend wandering in that space. Otherwise the individual imagination will be bulldozed over for the chain-store outlets of consumer appetite, true-crime titillations, and celebrity crises.

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.