Offset your carbon footprint on Wren: https://www.wren.co/start/tomrocksmaths. The first 100 people who sign up will have 10 extra trees planted in their name! After calculating my CO2 footprint with Wren, I look at the maths happening behind the scenes. A total of six categories are considered: cars, flights, diet, pets, clothing and energy costs. If you are looking for a way to reduce your carbon footprint, this video will help you to work out how much you can save by changing your habits. #climatecrisis #climatechange #carbonoffset Carbon report sources The base carbon calculator data comes from UC Berkeley's CoolClimate Network: https://coolclimate.berkeley.edu/calculator Country-specific baselines come from World Bank's CO2E repository: https://data.worldbank.org/indicator/EN.ATM.GHGT.KT.CE These two resources are also used to calculate the “your footprint by category” chart. Emissions comparisons sources Trees cut per year: The U.S. Forest Service estimates one 33 year old Gumtree has about 1.2 tons of carbon stored in it. https://www.fs.usda.gov/treesearch/pubs/52933 Square feet of Arctic sea ice loss: For every metric ton of carbon dioxide emitted, about three square meters (approximately 32.3 square feet) of Arctic summer sea ice is destroyed. https://science.sciencemag.org/content/354/6313/747 Cows burping per year: A special breathalyzer measured about 0.5kg of methane burped by one cow every day. Multiply that by 25 to get the CO₂ equivalent of methane, and that's 12.5kg per day, or 4.56 metric tonnes per year! https://www.ars.usda.gov/research/publications/publication/?seqNo115=358880 Burgers eaten: Exact numbers for emissions from one burger vary from 1.8 kg to as much as 335kg (factoring in deforestation for cattle farms). The more conservative estimate is used here. https://www.sixdegreesnews.org/archives/10261/the-carbon-footprint-of-a-cheeseburger Produced by Dr Tom Crawford at the University of Oxford. Tom is an Early-Career Teaching and Outreach Fellow in Mathematics at St Edmund Hall: https://www.seh.ox.ac.uk/people/tom-crawford For more maths content check out Tom's website https://tomrocksmaths.com/ You can also follow Tom on Facebook, Twitter and Instagram @tomrocksmaths. https://www.facebook.com/tomrocksmaths/ https://twitter.com/tomrocksmaths https://www.instagram.com/tomrocksmaths/ Get your Tom Rocks Maths merchandise here: https://beautifulequations.net/collections/tom-rocks-maths This video is sponsored by Wren.