'The most important number you've never heard of'
As the impacts of climate change add up, economists are trying to figure out what the true cost of a tonne of carbon really is.
«The social cost of carbon was needed because otherwise the benefits will always be measured in tonnes of carbon, and the costs in dollars, and the dollars will always win»
More from BBC News (World)
Forgetfulness: The benefits of when your mind goes blank
We've all had those frustrating moments when we struggle to recall someone's name. It turns out these momentary lapses may actually be good for your memory.
Why some people can't tell left from right
It can seem like an almost childish mistake, but a surprising number of adults confuse left from right and scientists are only just starting to understand why.
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