Global Budgets

The global targets are based on the IPCC carbon budgets documented in the Assumptions at the bottom of this page. There are no official targets but we have calculated what the limits would be if the limits for remaining under 1.5oC or 2oC were followed, and using the known emissions for the years 2011 to 2015. Global targets are specified as either Carbon (C) or Carbon Dioxide (CO2). 

The following charts are an example of what global emission reductions need to be along with the cumulative emissions resulting from the suggested limits. These charts assume that emissions are reduced at the same rate each year. This is obviously not realistic and is a best-case scenario. There is a history of global emissions here. They are examples of what global emission reductions need to be. We have included charts of 80% of 1990 levels (22,300 MtCO2) by 2050 for comparison (4,460 MtCO2). 1990 was the year that targets (for developed countries) in the Kyoto Protocol were based on.

Suggested emission reduction targets
Global carbon budgets and cumulative emissions resulting from the suggested emission reduction targets
This chart represents the limits for keeping the total global emissions under the carbon budgets for a likely chance of keeping global temperatures from rising more than 1.5 (green) and 2 (yellow) degrees C. It also includes an 80% by 2050 target since this is often used. 
The horizontal lines represent the global carbon budgets for a likely chance of keeping global temperatures from rising more than 1.5 (green) and 2 (yellow) degrees C. 

Click on the charts to see them full size
Both charts include suggested targets of 80% of 1990 emissions by 2050

The emission reduction targets for remaining below 1.5 or 2 degrees C are in this table (compared to 2011 emissions).

Year

 Less than 1.5oC

Less than 2oC

80% of 1990 levels

2020
36%
22,512 MtCO2
8%
32340 MtCO2
42% above
31,720 MtCO2
2030
100% (by 2028)
30%
24,500 MtCO2
2% above
22,630 MtCO2
2040
 
52%
16,669 MtCO2
40%
13,350 MtCO2
2050
 
75%
8,820 MtCO2
80%
4.460 MtCO2

 

What happens if we do not reduce our annual emissions?

According to CarbonBrief

[T]here are just over four years’ worth of current emissions left before it becomes unlikely that we’ll meet the 1.5C target without overshooting and relying on unproven “negative emissions” technologies to remove large amounts of CO2 out of the air later in the century."