According to Wikipedia
Climate justice is a term used for framing global warming as an ethical and political issue, rather than one that is purely environmental or physical in nature. This is done by relating the effects of climate change to concepts of justice, particularly environmental justice and social justice and by examining issues such as equality, human rights, collective rights, and the historical responsibilities for climate change. A fundamental proposition of climate justice is that those who are least responsible for climate change suffer its gravest consequences.
The term climate justice is also used to mean actual legal action on climate change issues. In 2017, a report of the United Nations Environment Programme identified 894 ongoing legal actions worldwide. At the end of 2018, a series of school strikes for climate started worldwide, inspired by Greta Thunberg’s original protest in Sweden.