There is no single definition of global challenges. According to Cambridge Dictionary global means relating to the whole world, challenge means something that needs great mental or physical effort in order to be done successfully and therefore tests a person’s ability. Consequently, global challenges are something that needs some effort at global level to be solved. It differs from global issues as to deal with them it is not enough to talk and think about them when trying to solve them, but it requires certain effort. Kirsten Gelsdorf makes it a little less complicated when she writes in her policy brief for UN OCHA that global challenges are defined as any major trend, shock, or development that has the potential for serious global impacts.