1.) UK's Brexit is an economic success, leading to a boom in Britain's tech sector and a modernized efficient state.
2.) Concerns about climate change will be a driver for terrible policy, further stifling the European economy.
3.) Probably not this decade, but it might happen near its end: Many European nations have their own vote leave, Denmark among others leave the union.
4.) The colonization of mars begins. By 2030 there is still no humans living on mars, but machines are shipped off to mars to start building the colony in which humans eventually will.