And ambiguity, to me, is very uncomfortable in my life, and I have it. Moral ambiguity.

Navigating the Anthropocene effectively and ethically is perhaps the most daunting challenge that modern humans have faced.

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And so if you need to study this sleeping problem, it's easy to study on plants, for example, than in animals and it's much more easy even ethically.

If so, there would be no denying that we continue to face grave problems, including of course the threat of catastrophic climate change. But there would nonetheless be some reason to hope for moral progress.

MELBOURNE With daily headlines focusing on war, terrorism, and the abuses of repressive governments, and religious leaders frequently bemoaning declining standards of public and private behavior, it is easy to get the impression that we are witnessing a moral collapse.

MELBOURNE With daily headlines focusing on war, terrorism, and the abuses of repressive governments, and religious leaders frequently bemoaning declining standards of public and private behavior, it is easy to get the impression that we are witnessing a moral collapse. But I think that we have grounds to be optimistic about the future.

LA PAZ Mother Earth is not for sale, the Bolivian representative told last year s United Nations climate change conference in Doha. But environmental policy in Bolivia itself undermines the government s efforts to assert moral superiority over other countries.

Bennett s decision was also ethical because, as the reference to the country s money suggests, she was not thinking only of herself. Opponents of legal voluntary euthanasia or physician assisted suicide sometimes say that if the laws were changed, patients would feel pressured to end their lives in order to avoid being a burden to others.

In these circumstances, to develop new coal projects is unethical, and to invest in them is to be complicit in this unethical activity. While this applies, to some extent, to all fossil fuels, the best way to begin to change our behavior is by reducing coal consumption.