The high - carbon alternative, the report warns, will lock the world
into dangerous levels of climate change that will upend economies for the foreseeable future.
To stand the best chance
of keeping the planetary warming below an internationally agreed target
of 3.6 degrees Fahrenheit above preindustrial
levels and thus avoiding the most
dangerous effects
of climate change, the panel found, only about 1 trillion tons
of carbon can be burned and the resulting gas spewed
into the atmosphere.