Climate change lawsuits are an essential strategy to tackle environmental issues. In this sector, local and international courts resolve disputes, hold governments and businesses accountable, and change policy. This paper examines how national and international courts have shaped climate action through climate litigation. Regional and international tribunals like the European Court of Human Rights (ECHR) and International Court of Justice (ICJ) help address transboundary environmental issues and preserve climate change treaties. These courts address government disputes and ensure that nations fulfil accords like the Paris Agreement and are held accountable for climate promise violations. The opportunities international tribunals afford disadvantaged communities and Non-Governmental Organization (NGOs) to seek global justice amplifies the voices of climate change victims. Federal courts enforce environmental legislation and interpret environmental constitutional rights. National climate litigation often sues governments and companies for releasing greenhouse gases, implementing insufficient climate measures, or neglecting at-risk people. Significant rulings in these cases may set new legal norms, encourage governments to take greater climate action, and make polluters pay for their environmental harm. National courts may promote climate justice by giving vulnerable communities legal choices to challenge its unjust impacts. Environmental justice projects are increasingly employing lawsuits to demand fairer climate policies and hold powerful people and businesses accountable for environmental damage. National and international courts must work together to tackle climate injustice through climate litigation. Local courts enforce laws and defend communities, whereas international courts address cross-border conflicts and execute international accords. By enhancing climate governance frameworks, these legislative instruments enable more egalitarian and sustainable futures.