Climate change is our planet's greatest existential threat.If we don't limit greenhouse gas emissions from the burning of fossil fuels, the consequences of rising global temperatures include massive crop and fishery collapse, the disappearance of hundreds of thousands of species, and entire communities becoming uninhabitable.And because climate change and rising inequality are interconnected crises, decision makers must take action to combat both--and all of us must fight for climate justice.They have the fewest financial resources to respond to crises or adapt, and they're closely dependent on a healthy, thriving natural world for food and income.While these outcomes may still be avoidable, climate change is already causing suffering and death.