I haven't heard of any solid data suggesting what the actual cost and benefits are, beyond the "sky is falling" arguments
I don't think you've been listening hard if you haven't heard of the Sterm Review. It's 700 pages long and doesn't refer to the sky falling at all. I keep seeing references to "sky is falling" arguments, but I haven't heard of any. Could you point me to one?
The clearest way into the Universe is through a forest wilderness. -- John Muir