From petitioning to save forests to raising cash for disaster victims, a growing army of K-pop fans worldwide has emerged as the latest force in the global fight against climate change.

Young and tech-savvy, K-pop lovers have used their social media power to take up political causes, including mobilizing funds for the Black Lives Matter movement in the United States last year and supporting Thailand's pro-democracy protests.

But the group is now increasingly vocal on climate change, shining a youth spotlight on environmental issues that get relatively little attention in some parts of the world.