Are these scientists serious? Reuters:

A group of 28 experts suggested nine key areas, such as freshwater use, chemical pollutants or changes in land use, where governments could define limits to ensure a “safe operating space for humanity.”
“Today we are clearly driving development in the world blindfolded,” Johan Rockstrom, leader of the study and director of the Stockholm Resilience Center at Stockholm University, told Reuters of a lack of international guidelines.
“We are not considering the risks that there are deep holes we can drive into,” he told Reuters. The call, for setting “planetary boundaries,” was published in Thursday’s edition of the journal Nature.
Rockstrom said there were signs human activities had already pushed the world into the danger zone because of global warming, a high rate of extinctions of animals and plants and pollution caused by nitrogen, mainly used in fertilizers.
Among limits, they suggested capping the percentage of global land area converted to cropland at 15 percent. At the moment, the percentage is 11.7 percent, they said.

Sorry, Third World. I know your populations are hungry, but we’re just not allowed to grow more food. When you starve to death, please do so in a carbon-neutral manner. Thank you!