The government argues that without a price, the living world is accorded no value, so irrational decisions are made. By costing nature, you ensure that it commands the investment and protection that other forms of capital attract.
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.
Food production is ripping the living world apart. Fishing and farming are, by a long way, the greatest cause of extinction and loss of the diversity and abundance of wildlife. Farming is a major cause of climate breakdown, the biggest cause of river pollution and a hefty source of air pollution.
As SUVs are higher and heavier, they are more likely to kill the people they hit. Driving an SUV in an urban area is an antisocial act.
We urgently need more trees, but we appear to believe that the only means of restoring them is planting. We have a national obsession with tree planting, which is in danger of becoming as tokenistic as bamboo toothbrushes and cotton tote bags.
If commercial fishing were excluded from large areas of the sea, the total catch would be likely, paradoxically, to rise, due to what biologists call the spillover effect.
What you see is not what others see. We inhabit parallel worlds of perception, bounded by our interests and experience. What is obvious to some is invisible to others.
We should be cautious about embracing data before it is published in the academic press, and must always avoid treating correlation as causation.
We are often told that curtailing the freedom of business is coercive and undemocratic. But by what democratic principle should corporations and billionaires decide the fate of current and future generations? When a government releases them from regulation, it allows them to determine whether other people live or die.
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.
We should seek to love our lives and live fully, but not to extend them indefinitely. We should love our children exuberantly, but not cling to them or curtail their freedoms. We should treasure the material world without seeking to own and control it.
Pedestrians and cyclists are squeezed by planners into narrow and often dangerous spaces - the afterthoughts of urban design.
The people of each generation perceive the state of the ecosystems they encountered in their childhood as normal and natural. When wildlife is depleted, we might notice the loss, but we are unaware that the baseline by which we judge the decline is in fact a state of extreme depletion.
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.
We have a wider political and economic system in which ancient, landed power still carries immense weight. There is nothing some landowners would like more than to set the police on those who dare to venture into their vast estates.
As some of us can testify, the viciousness of the lobby groups funded by the fossil fuel industry, and the publications that amplify their message, knows no limits. As we have already seen, they treat even children as fair game.
Farmfree production promises a far more stable and reliable food supply that can be grown anywhere, even in countries without farmland. It could be crucial to ending world hunger.
Fear hems us in, stops us from thinking clearly, and prevents us from either challenging oppression or engaging calmly with the impersonal fates.
Rainforests are not confined to the tropics: a good definition is forest wet enough to support epiphytes - plants that grow on other plants. Particularly in the west of Britain, where tiny fragments persist, you can find trees covered in rich growths of a fern called polypody, mosses and lichens, and flowering plants climbing the lower trunks.
When you are diagnosed with prostate cancer, your condition is ranked on the Gleason Score, which measures its level of aggression. Mine is graded at seven out of 10. But this doesn't tell me where I stand in general.