Here is a selection of banners you can place on your website to link to Greenpeace.

Also there are snippets of HTML you can copy and paste directly into your webpage to make the banners work.
The following are in large format but at the bottom of this page are two smaller banners.

<a href="http://www.greenpeace.org/" target="_blank"><img 
          src="http://archive.greenpeace.org/banners/climate.gif" width="468" height="60"
          title="Visit Greenpeace.org and help save the climate."
alt="Visit Greenpeace.org and help save the climate." border="0"></a>

<a href="http://www.greenpeace.org/" target="_blank"><img 
          src="http://archive.greenpeace.org/banners/last_tree.gif" width="468" height="60"
          title="Visit Greenpeace.org to help prevent environmental destruction."
alt="Visit Greenpeace.org to help prevent environmental destruction." border="0"></a>

<a href="http://www.greenpeace.org/" target="_blank"><img 
          src="http://archive.greenpeace.org/banners/save_delete.gif" width="468" height="60"
          title="Visit Greenpeace.org to help prevent environmental destruction."
alt="Get Active - Greenpeace.org" border="0"></a>

<a href="http://www.greenpeace.org/" target="_blank"><img 
          src="http://archive.greenpeace.org/banners/truth.gif" width="468" height="60"
          title="The info the GE industry doesn't want you to see on Greenpeace.org"
alt="The info the GE industry doesn't want you to see on Greenpeace.org" border="0"></a>

<a href="http://www.greenpeace.org/" target="_blank"><img 
          src="http://archive.greenpeace.org/banners/ocean.gif" width="468" height="60"
          title="Visit Greenpeace.org to help save your seas."
alt="Visit Greenpeace.org to help save your seas." border="0"></a>

<a href="http://www.greenpeace.org/" target="_blank"><img 
          src="http://archive.greenpeace.org/banners/nuclear.gif" width="468" height="60"
          alt="Help rid the world of Nukes - visit Greenpeace.org" border="0"></a>

<a href="http://www.greenpeace.org/" target="_blank"><img 
          src="http://archive.greenpeace.org/banners/surf468-x-60.gif" width="468" height="60"
          alt="Join the Greenpeace cyberactivist community and start making waves." border="0"></a>

<a href="http://www.greenpeace.org/" target="_blank"><img 
          src="http://archive.greenpeace.org/banners/surf230-x-33.gif" width="230" height="33"
          alt="Join the Greenpeace cyberactivist community and start making waves." border="0"></a>

<a href="http://www.greenpeace.org/" target="_blank"><img 
          src="http://archive.greenpeace.org/banners/surf120-x-43.gif" width="120" height="43"
          alt="Join the Greenpeace cyberactivist community and start making waves." border="0"></a>