Argument: Leakage of C02 from storage sites is a risk
Greenpeace International, an environmental non-profit organization, stated the following in a May 2008 report authored by Emily Rochon et al., titled "False Hope: Why Carbon Capture and Storage Won't Save the Climate," available at www.greenpeace.org: "As long as CO2 is in geological sites, there is a risk of leakage. While it is not currently possible to quantify the exact risks, any CO2 release has the potential to impact the surrounding environment; air, groundwater or soil. Continuous leakage, even at rates as low as 1%, could negate climate mitigation efforts.
Rainforest Action Network, an environmental non-profit organization, stated the following in a fact sheet on its website titled "The Dirty Truth about Clean Coal," available at www.ran.org (accessed Sep. 17, 2009): "Carbon dioxide is a colorless, odorless gas that can be fatal to humans exposed to high concentrations. In 1986, a C02 leak killed nearly 1,800 people instantly in Lake Nyos, Cameroon. The leak was but a tiny fraction of the amount of C02 we would need to store annually from coal plants... "