nuclear drills, as fears grow about an escalation of the war in ukraine. and the with a difference, hundreds of runners where they most stylish stilettos to take part in washington s annual high heel drag queen race. welcome to our viewers on pbs in america and around the globe. united nations secretary general says the world is heading for a catastrophe unless climate change is prioritised. concentrations of the three main greenhouse gases rose to concentration levels unprecedented. next month they will meet in egypt for, 27. cop27. it has been a year of extreme weather. devastating floods in pakistan, drought in somalia with millions threatened by famine, and record breaking heat in the uk and many other countries. it s why the un chief says climate is the most important issue in his in tray. climate change is the crisis of our lifetime. it s the defining issue of today s world. so, climate change remains a central priority in everything we do. if we are not able to r