Sarah has been studying dark matter and dark energy for the last 20 years, but when her kids started school she started to think about our own planet in the next 20 years and beyond. She learned about climate change properly for the first time, how it threatens worldwide food production, and how food causes about a quarter of all global warming.

Sarah wanted to know how much each of her food choices was contributing, and why. She delved into the academic research literature, and summarized the results in simple charts. The charts make it easy for the non-specialist to see the impacts of different meal options, and show that some easy food switches can reduce food greenhouse gas emissions by 90 percent.

Most of us make many food choices every day, and by changing these we can significantly reduce climate change caused by food, and free up land that can be used to help reduce climate change overall.