Suggesting such areas is also part of the thinking process. A special 'Creative Hit List' can be kept of iddeas that specifically require creativity. Members who do this should be prepared to answer questions that might be asked. All members should be agreed upon this. Local or community problems can be brought along - sometimes with the person of the body which owns the problem.
Members can even set up a 'task force' to deal with a local problem.
They can certainly be part of the thinking of clubs but only part. The purpose of the club is not to solve all the world's problems but to enjoy thinking. Large world problems need to be broken down into sub-problems or smaller focuses. It may arise that a member does not want to invite thinking on a subject but just to make a speech giving his or her own view. There is no obligation to do so.