A new analysis estimates that the Keystone XL planet-roaster pipeline will result in [ 120 million tons of extra annual CO2 emissions ](
http://www.theguardian.com/environment/2014/aug/11/keystone-xl-carbon-emissions-would-be-four-times-higher-than-us-thought ) , not merely 30 million. This is because it would result in a lower price for oil, which would encourage users to burn oil rather than invest in alternatives. Although this is a small fraction of what the human world emits, it is an investment in increasing the emissions, when what we need to do is invest in decreasing them. We must also end the subsidies for oil. Better an increase in price now, than a big jump in price in 5 years.
Ссылка:
https://stallman.org/archives/2014-may-aug.html#12_August_2014_%28Emissions_estimates_for_Keystone_XL%29