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When we think about climate change, normally what springs to mind could be rising temperatures and freak weather conditions. Our planet is definitely changing and we are pumping a lot of CO2 into the atmosphere – one big indicator of this was when the 400ppm CO₂ measurement ‘milestone’ was recorded during May 2013¹. However, have you ever thought about what past climates might have been like and how you could find this sort of information out?