Two world renowned scientists in their field, Professors William Happer and W.A. van Wijngaarden write:"So the contribution of methane to the annual increase in forcing is one tenth (30/300) that of carbon dioxide. The net forcing from CH and CO increases is about 0.05 W m−2 year−1. Other things being equal, this will cause a temperature increase of about 0.012 C year. Proposals to place harsh restrictions on methane emissions because of warming fears are not justified by facts."