Scientists tell exceeding this limit could lead to dangerous pandemic warming.
"We urgently itch to change our economy to persuasive within its environmental budget," vocal Nef's policy director.
Andrew Simms added: "There is no global, environmental money bank to bail us surface if we become ecologically bankrupt."
None of the existing models or policies could "square the circle" of economic winnings with climate safety, Nef added.
'No magic bullets'
In the report, Growth Isn't Possible, the authors looked at the main models whereas climate change and energy perk domination the global economy.