How much carbon is too much?

In this video Oxford graduate Simon Clarke talks about how much carbon we can emit into the Earth's atmosphere before climate change gets really serious. This is based on a paper published by Allen et al (2009) https://www.nature.com/articles/natur... which claims the atmosphere has a capacity of approximately one trillion tonnes of carbon...

https://www.youtube.com/watch?v=jUQrNt72_Os

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