So much for the science. As a scientist, this is what I’m expected to say. And yet, this weekend as I sat in my garden, listening to Glastonbury on the radio and watching my children trying to keep cool in the paddling pool, I was overcome for the first time with a feeling I could not shake off. Guilt, and fear. Guilt, that by being too scientific about these things, I don’t have enough passion and impetus to do everything I can about it. And fear for the future we are leaving for my children. For all our children.