For references see:
http://climateradio.org/40-our-climate-is-not-your-business/#more-1644
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The 300-350 Show is made for ResonanceFM in London and is syndicated free to not-for-profit community radio stations and independent media outlets around the globe.
The programme is named after what is now believed to the safe level in parts per million (ppm) of carbon dioxide in the atmosphere. This finding is based on the work of James Hansen and his team in a paper titled "Target Atmospheric CO2: Where Should Humanity Aim." http://arxiv.org/abs/0804.1126