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![](http://up.wiki.x.io/wikipedia/commons/thumb/c/c2/C-141_Starlifter_contrail_crop1.png/340px-C-141_Starlifter_contrail_crop1.png)
Photo credit: United States Air Force
The IPCC estimates that aviation will account for 4% of all carbon emissions released by human activity by 2050.
Photo credit: United States Air Force
The IPCC estimates that aviation will account for 4% of all carbon emissions released by human activity by 2050.