What is the term for the maximum allowable emissions over time?

The term "carbon budget" refers to the cumulative amount of carbon dioxide emissions that can occur over a set period while still being consistent with a specific climate goal, such as limiting global warming to a particular temperature threshold. This concept emphasizes the importance of accounting for emissions over time, as it takes into consideration both current and future emissions and helps establish a clear target for reducing greenhouse gas outputs. By giving a holistic view of acceptable emissions, a carbon budget supports the strategic planning necessary for achieving sustainability goals and adhering to international climate agreements.

Other terms, such as carbon tax or emission cap, although related to carbon emissions, focus on different aspects of climate policy. A carbon tax is a financial charge based on the amount of carbon dioxide emissions produced and aims to incentivize reductions through market mechanisms. An emission cap generally refers to a regulatory limit on emissions within a specified timeframe but does not imply a cumulative approach like the carbon budget does. Lastly, a sustainability threshold indicates broader limits for sustainable practices but does not specifically relate to a quantifiable emissions target like the carbon budget does.