On one of our walks along the beach in Bray, my five- and eight-year-old sons and I decided we’d do a message in a bottle. Photograph: Marine Biological Association/PA Growing up, I was always a glass-half-empty sort of person. A doomsdayer. A catastrophiser. Thinking of the worst-case scenario was my speciality. “Stop with those negative waves Moriarty,” my dad would often say to me – a reference to Donald Sutherland’s Oddball character in the 1970 film Kelly’s Heroes. Sutherland’s out-of-place 70s hippy in the middle of the second World War may have been a tongue-in-cheek nod to the era in...