Common but differentiated responsibilities" (CBDR). This is a principle in international environmental law that recognizes that all nations are responsible for addressing global environmental issues but acknowledges that each has different capabilities and levels of responsibility in doing so.

Here’s a breakdown:

1. Common: All nations have a shared responsibility to address global environmental challenges, such as climate change or biodiversity loss.

2. Differentiated: Nations have different abilities and levels of impact on these issues, so their contributions and commitments may vary based on factors like their level of development, economic capacity, and historical contributions to the problem.

CBDR is widely applied in international environmental agreements, especially in climate change discussions. It emphasizes fairness by asking countries with greater resources and historical contributions to environmental degradation to take on a larger share of responsibility and action