http://en.wikipedia.org/wiki/World_energy_consumption
Emissions
To limit global temperature
to a hypothetical 2 degrees Celsius rise would demand a 75% decline in carbon
emissions in industrial countries by 2050, if the population is 10 billion in
2050. Across
40 years, this averages to a 2% decrease every year. In 2011, the emissions of
energy production continued rising regardless of the consensus of the basic
problem.
Hypothetically, according to Robert Engelman (Worldwatch
institute), in order to prevent collapse, human civilization would have to stop
increasing emissions within a decade regardless of the economy or population
(2009).
If production and consumption of
coal continue at the rate as in 2008, proven and economically recoverable world
reserves of coal would last for about 150 years. This is much more than needed
for an irreversible climate catastrophe. Coal is the largest source of carbon dioxide emissions in the world.
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