However, before the idea of carbon taxes became popular, many governments already had similar taxes in place, i.e., fuel and energy taxes. (globalwarmingsolved.com)
Some other technologies, like fuel cells and small wind turbines, have access to similar tax credits through 2016. (nytimes.com)
As such, it receives similar tax treatment as IRAs: no taxes are paid until distributions are made. (annuities.blueprintincome.com)