We estimate the macroeconomic impacts of carbon taxes on GDP and employment growth rates using 30 years of data on carbon taxation in various European countries. We find no evidence for a negative impact on employment or GDP growth but rather find a zero to modest positive impact. We also find a cumulative emissions reduction on the order of 4 to 6 percent for a $40/ton CO2 tax covering 30 percent of emissions. Reductions would likely be greater for a broad-based US carbon tax since European carbon taxes typically do not cover those sectors with the lowest marginal abatement costs.