Source: <a rel="nofollow" class="external text" href="http://www.slate.com/blogs/bad_astronomy/2012/12/11/climate_change_denial_why_don_t_they_publish_scientific_papers.html">www.slate.com/blogs/bad_astronomy/2012/12/11/climate_chan…</a> Image credit: <a href="https://en.wikipedia.org/wiki/James_L._Powell" class="extiw" title="w:James L. Powell">James Lawrence Powell</a>.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/81669195@N00">Wolf Gang</a>
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/wolfgangkuhnle/8264768471/">On global warming</a>