Human-induced warming: ---------------- °C

Total Carbon Dioxide emissions: ---------------- trillion tonnes

(Equivalent tonnes of Carbon: ---------------- tonnes)

Other Human influences on climate: ---------------- Watts per square metre





Why are we now providing three numbers?



Human-induced warming ( ΔT ) over a time-interval ranging from seconds to decades is proportional to total cumulative carbon dioxide emissions over that time-interval (E CO 2 ) plus the impact of any change in global energy imbalance due to other human influences on climate ( ΔF other ).



We can write this as an equation [1]: $$ {\color{red} {ΔT}} = {\color{blue}κ} ⋅ \left( E_{CO_{2}} + {{ {\color{grey} { ΔF_{other} }} } \over {\color{blue}α}} \right) $$

where κ is the “Transient Climate Response to Emissions” (about 0.4°C per trillion tonnes of CO 2 [2]) and α is the “Normalised Absolute Global Warming Potential” of CO 2 (about 1.0 W/m2 per trillion tonnes of CO 2 [3]).



Don’t take our word for it: add them up and check! Now you know what’s causing global warming.







Current Global Warming Index



The first graph shows an index of human-induced global warming relative to the second half of the 19th century (1850-1900). The second graph shows index together with the associated CO 2 and other forcing contributions. globalwarmingindex.org is provided by the Oxford University Environmental Change Institute. See here for further details about the graphic above.