Until fishing is properly regulated and contained, we should withdraw our consent. Save your plastic bags by all means, but if you really want to make a difference, stop eating fish.
For some of Britain's most powerful people, hunting and shooting are primordial rights, and any challenge to them is treated as illegitimate. They assert ownership not only of the land but also of the social relationships surrounding it.
Landowners, farmers and gamekeepers, though they comprise a small minority of the rural population, claim to speak for everyone, and dismiss those who challenge them as interfering urbanites.
While some people have rejected capitalism gladly and swiftly, I've done so slowly and reluctantly. Part of the reason was that I could see no clear alternative: unlike some anti-capitalists, I have never been an enthusiast for state communism.
As the scale of economic activity increases until capitalism affects everything, from the atmosphere to the deep ocean floor, the entire planet becomes a sacrifice zone: we all inhabit the periphery of the profit-making machine.
Healthy populations of predatory crabs and fish protect the carbon in salt marshes, as they prevent herbivorous crabs and snails wiping out the plants that hold the marshes together.
What I love about natural climate solutions is that we should be doing all these things anyway. Instead of making painful choices and deploying miserable means to a desirable end, we can defend ourselves from disaster by enhancing our world of wonders.
Technological change is essential, but to a natural historian it often feels cold and distancing.
Yes, the car is still useful - for a few people it's essential. It would make a good servant. But it has become our master, and it spoils everything it touches.
New roads carve up the countryside, dispelling peace, creating a penumbra of noise, pollution and ugliness. Their effects spread for many miles.
Pedestrians and cyclists are squeezed by planners into narrow and often dangerous spaces - the afterthoughts of urban design.
A central task for any campaign is to develop a narrative: a short, simple story explaining where we are, how we got here and where we need to go.
Successful movements also need an organisational model that allows them to keep growing.
In thinking about male identities, I'm struck by the inadequacy of the terms we use. The notion that men should be distant, domineering and self-seeking is often described as toxic masculinity, but this serves only to alienate those who might need most help.
The age-old mistake, which has stunted countless lives, is the assumption that because physical hardship in childhood makes you physically tough, emotional hardship must make you emotionally tough.
Emotionally damaged men all too often rip apart their own lives, and those of their partners and children. I see both physical fitness and emotional strength as virtues, but they are acquired by entirely different means.
The Enlightenment ideal, which all universities claim to endorse, is that everyone should think for themselves.
Only one of the many life support systems on which we depend - soils, aquifers, rainfall, ice, the pattern of winds and currents, pollinators, biological abundance and diversity - need fail for everything to slide.
Wildlife film-makers I know tell me that the effort to portray what looks like an untouched ecosystem becomes harder every year. They have to choose their camera angles ever more carefully to exclude the evidence of destruction, travel further to find the Edens they depict.
Farming and fishing are the major causes of the collapse of both marine and terrestrial ecosystems. Meat - consumed in greater quantities by the rich than by the poor - is the strongest cause of all.
