It’s easy to get overwhelmed by something as big and scary as climate change, but it doesn’t have to be like this. What if we resolved to cut our carbon by 10% in a year? Not a bad start. Then what if we got everyone we know to do the same? Then what if the companies we work for got involved? And our children’s schools? How about city councils? Post offices. Football clubs. Factories. Donkey sanctuaries. All uniting to tackle the defining challenge of our time.