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For the lastthreeyears, 10/10 has been the day we knock on cynicism's door and run away giggling. The day we put clingfilm over the toilet of business-as-usual, and order unwanted takeaways to the house of despair.
This year we're relaunching our #itshappening project, which showcases all the best climate success stories from around the world.
Have you heard: there's a major new climate report out today.
Wait! Don't go. This one's important!
This report – from the UN's Intergovernmental Panel on Climate Change (IPCC) is likely to dominate the discussion for the next couple of weeks, and with so many myths and half-truths flying around, it's only a matter of time until one hits you in the head.
So here's a quick primer for when your climate sceptic uncle Bob comes over for dinner.