Climate justice has increasingly grabbed headlines since, and many of those driving positive action to protect the environment are still at school. Just as with the topic of sustainability as a whole, the cause of climate change is complex. There are no humans without the earth.’AdvertisementOluwaseyi MoejohTO SOLVE THE CRISIS WE NEED GLOBAL CITIZENS. Ask the University of Buenos Aires political science student what he thinks the biggest causes of climate change are and you won’t hear clichés. ‘To solve the crisis, we need global citizens.