Per-Capita Carbon Budget Calculator

Per-Capita Carbon Budget Calculator

Climate science expresses how much more CO2 humanity can emit while keeping warming below a given target (like 1.5┬░C or 2┬░C) as a "remaining carbon budget" - this calculator divides that budget equally across the global population to illustrate the scale involved.

Per-Capita Budget = Remaining Global Carbon Budget / Global Population

Example

A remaining global budget of 250 billion tonnes CO2, shared across 8 billion people:

Per-Capita Budget = 250 / 8 = 31.25 tonnes CO2 per person (a lifetime total, not an annual figure)

What "Remaining Carbon Budget" Means

Climate assessments like those from the IPCC estimate a finite total amount of CO2 that can still be emitted globally before a given temperature threshold is likely to be exceeded - this figure shrinks each year as emissions continue, which is why remaining budget estimates for any given temperature target get smaller over time rather than staying fixed.

Why Equal Per-Capita Sharing Is a Simplification

This calculator illustrates the scale of the challenge using a simple equal-division approach, but real international climate policy negotiations involve far more complex questions about equitable allocation - accounting for hugely different historical cumulative emissions between countries, current development needs, and existing per-capita emission levels that vary enormously worldwide.