A makeshift shrine to Harambe, the zoo gorilla whose death has raised some uncomfortable moral questions. William Philpott/Reuters

How do we weigh the moral value of human lives against animal ones?

We tend instinctively to value human lives over non-human ones. But is there a point where the scales might tip the other way?
A better society is one way to motivate people to take action on climate change,. Earth image from www.shutterstock.com

People around the world will act on climate change to create a better society: study

If we can convince people that climate change is real and important, then surely they will act: this intuitive idea underlies many efforts to communicate climate change to the public. But it may not be the best way.

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