I find it extraordinary that anyone would have an intellectual conversion to Roman Catholicism.
— Peter Singer
I think I get angry when people cause serious suffering or don't alleviate suffering when they could.
Almost everybody accepts that some people can be killed. 'The concept of 'brain death' - the belief that people on respirators can legitimately be killed - shows that.
In the real world, 90% of the money spent on medical research is focused on conditions that are responsible for just 10% of the deaths and disability caused by diseases globally.
Of those who die from avoidable, poverty-related causes, nearly 10 million, according to UNICEF, are children under five. They die from diseases such as measles, diarrhea, and malaria that are easy and inexpensive to treat or prevent.
Most of the robots being developed for home use are functional in design - Gecko's homecare robot looks rather like the Star Wars robot R2-D2. Honda and Sony are designing robots that look more like the same movie's 'android' C-3PO.
Attempts to defend amusement parks and circuses on the grounds that they 'educate' people about animals should not be taken seriously. Such enterprises are part of the commercial entertainment industry. The most important lesson they teach impressionable young minds is that it is acceptable to keep animals in captivity for human amusement.
Even with censorship, the Internet is a force for change.
When I was a child, my father used to take me for walks, often along a river or by the sea. We would pass people fishing, perhaps reeling in their lines with struggling fish hooked at the end of them. Once I saw a man take a small fish out of a bucket and impale it, still wriggling, on an empty hook to use as bait.
For a long time, rich countries have promised to reduce poverty but have failed to match their words with adequate action. Of course, some important progress has been made and millions of lives have been saved, but millions more could be saved.
When diamonds' role in fuelling violent conflict in Africa gained worldwide attention, the diamond industry established the Kimberley process in order to keep "blood diamonds" out of international trade.
Open government is, within limits, an ideal that we all share. U.S. President Barack Obama endorsed it when he took office in January 2009.
Some vegetarians and vegans may object to in vitro meat, because they don't see the need for meat at all. That's fine for them, and of course they are free to remain vegetarians and vegans and choose not to eat in vitro meat.
If people are prepared to eat locally and seasonally, then they probably do pretty well in terms of environmental impact.
I just don't think that the differences you make by donating to a museum or an art gallery really compare to the differences you make by donating to the charities that fight global poverty.
We may feel the pain of falling back from a level of affluence to which we have grown accustomed, but most people in developed countries are still, by historical standards, extraordinarily well off.
Do business managers have a commitment to anything more than the success of their company and to making money? It would be hard to say that they do. Indeed, many business leaders deny that there is any conflict between self-interest and the interests of all.
There's a difference between early and late abortions. If you have a late abortion, where the fetus might feel pain, then I think you should have a good reason. Because then you're inflicting pain. As you go through the third trimester, you need to have more serious reasons to end a pregnancy.
We tend to think that people are more to blame for their acts than for their omissions.
I have never really been fond of animals. I certainly wasn't an 'animal lover' when I became involved in the movement. I just came to be persuaded that animals should be treated as independent sentient beings, not as means to human ends.
In an ideal world, the amount of money we spend on medical research to prevent or cure a disease would be proportional to its seriousness and the number of people who suffer from it.
There is no doubt that the world economy is in trouble. But if governments or individuals use this as an excuse to reduce assistance to the world's poorest people, they will only multiply the seriousness of the problem for the world as a whole.
Robots already perform many functions, from making cars to defusing bombs - or, more menacingly, firing missiles. Children and adults play with toy robots, while vacuum-cleaning robots are sucking up dirt in a growing number of homes and - as evidenced by YouTube videos - entertaining cats.
Several countries - among them Austria, Costa Rica, Denmark, Finland, India, Israel and Sweden - ban or severely restrict the use of wild animals in circuses. In Brazil, a movement to ban wild animals from circuses started after hungry lions managed to grab and devour a small boy.
Google has withdrawn from China, arguing that it is no longer willing to design its search engine to block information that the Chinese government does not wish its citizens to have. In liberal democracies around the world, this decision has generally been greeted with enthusiasm.
More people with HIV/Aids are getting inexpensive anti-retroviral drugs, and their life expectancy has increased, but universal access is still far off, and the disease is still spreading, if more slowly than before.
If we use goods made from raw materials that are obtained from a poor country without the proceeds being used to benefit the people of that country, we become complicit in a particularly iniquitous form of grand larceny.
Diamonds have an image of purity and light. They are given as a pledge of love and worn as a symbol of commitment.
Many European countries, as well as Australia, Canada, Israel, and New Zealand, have adopted legislation that creates a 'public lending right', where the government recognises that enabling hundreds of people to read a single copy of a book provides a public good, but that doing so is likely to reduce sales of the book.
When you look at food as an ethical issue in the Christian tradition, you don't find very much about it. You don't find, as you do in the Jewish or Islamic or Hindu traditions, a lot of restrictions saying you can eat this but you can't eat that.
It was wrong to capture wild animals and confine them in captivity for people to go and gawk at them. And that's basically how zoos got started. But once you do that, and once you have animals that have been bred in captivity, you're really stuck with them in some sense. You can't return them to the wild.
It's because I work in ethics, and, more specifically, applied ethics, that I think it's important that if you have things to say that you think are right and you think could make the world a better place, it's important that many people read about them.
Of those who die from avoidable, poverty-related causes, nearly 10 million, according to UNICEF, are children under five. They die from diseases such as measles, diarrhoea, and malaria that are easy and inexpensive to treat or prevent.
Every profession will have its rogues, of course, no matter what oaths are sworn, but many health care professionals have a real commitment to serving the best interests of their clients.
Americans think they're the leader of the world and yet can say that they're putting their economic interests ahead of the lives of - quite possibly - tens of millions of people who over the next 50 years will die because of floods or storms or tropical diseases or whatever. I guess that sort of thing makes me angry.
All I say about severely disabled babies is that when a life is so miserable it is not worth living, then it is permissible to give it a lethal injection. These are decisions that should be taken by parents - never the state - in consultation with their doctors.
You shouldn't say 'animals' to distinguish between humans and non-humans. We are all animals.
If extreme poverty is allowed to increase, it will give rise to new problems, including new diseases that will spread from countries that cannot provide adequate healthcare to those that can. Poverty will lead to more migrants seeking to move, whether legally or not, to rich nations.
Of all the arguments against voluntary euthanasia, the most influential is the 'slippery slope': once we allow doctors to kill patients, we will not be able to limit the killing to those who want to die.
There is no excuse for keeping wild animals in amusement parks or circuses. Until our governments take action, we should avoid supporting places where captive wild animals perform for our amusement. If the public will not pay to see them, the businesses that profit from keeping animals captive will not be able to continue.
In most countries, it is possible to visit zoos and see bored animals pacing back and forth in cages, with nothing to do but wait for the next meal. Circuses are even worse places for animals. Their living conditions are deplorable, especially in travelling circuses where cages have to be small so that they can go on the road.
The price we are willing to pay for safety cannot be infinite. It is distasteful to put a price on human life, but the more we spend on safety, the less we will have for our other goals.
To make sustainable progress in reducing extreme poverty will require improvements in both the quantity and quality of aid.
Paradoxically, resource-rich developing countries are often worse off than comparable countries that lack those resources. One reason for this is that large resource endowments provide a huge financial incentive for attempts to overthrow the government and seize power.
Even in non-democratic countries, people have a legitimate interest in knowing about actions taken by the government.
My own view is that being a vegetarian or vegan is not an end in itself, but a means towards reducing both human and animal suffering and leaving a habitable planet to future generations.
I don't eat meat. I've been a vegetarian since 1971. I've gradually become increasingly vegan. I am largely vegan, but I'm a flexible vegan. I don't go to the supermarket and buy non-vegan stuff for myself. But when I'm traveling or going to other people's places, I will be quite happy to eat vegetarian rather than vegan.
If somebody has an extreme amount of wealth and is not using it for some good purpose, only for their own enjoyment or satisfaction, then clearly there's a moral failing in the world in which we live.
We need to recognise that what really matters isn't buying more and more consumer goods, but family, friends, and knowing that we are doing something worthwhile with our lives. Helping to reduce the appalling consequences of world poverty should be part of that reassessment.
Without in any way minimising the economic and psychological blow that people experience when they lose their jobs, the unemployed in affluent countries still have a safety net, in the form of social security payments, and usually free healthcare and free education for their children. They also have sanitation and safe drinking water.
