Young voters did this, ironically enough, according to BBC World News. Young people struggling to get jobs after graduation think that right wing parties will fix that.
So as older generations are trying not to hand-off a burning planet to the young, the young are signing up for a burning planet under some delusion that right wingers will get them jobs. Schools have apparently failed to teach kids that the jobs they get under conservative governance are shit jobs -- lousy pay and lousy benefits.