Almost.. the IEA puts it at 2-59 grams per kwh. Hydro at 2-49g; wind at 7-124g; and solar at 13-731g. In comparison to nat gas at 389-511g.<p>Hydro and nuclear are pretty much tied. And wind is a close 3rd.<p>see page 134: also has SO2, NOX, and a few other stats:
<a href="http:&#x2F;&#x2F;www.oecd-nea.org&#x2F;ndd&#x2F;reports&#x2F;2002&#x2F;nea3676-externalities.pdf" rel="nofollow">http:&#x2F;&#x2F;www.oecd-nea.org&#x2F;ndd&#x2F;reports&#x2F;2002&#x2F;nea3676-externaliti...</a>