Gore also frets about the future of polar bears.

Indeed, China frets over the safety of the US Treasury bonds that it holds.

Bill McKibben similarly frets in The Guardian and The Daily Beast about the Midwest drought and corn prices.

While the world frets about North Korean and Iranian nuclear weapons, it is useful to remind ourselves that Japan, should it choose, could become a nuclear power in a matter of weeks.

I have been proud and privileged to have spent my life in the theatre, a poor player that struts and frets his hour upon the stage, and I've been honored to be, for 40 years, chief prompter of the Sarah Siddons Society.