anchor.diff:        <div class='source_header'>
           <strong class='source_title'>University of Maryland/Google tree cover gain</strong>
           <i class='expand_arrow'></i>
  -        <em class='source_description'>(annual &amp; 12 years, 30m, global)</em>
  +        <em class='source_description'>(12 years, 30m, global)</em>
         </div>
   
         <div class='source_body'>
  
positive.code:           </dl>
            <dl class='sources_row even'>
              <dt>Date of content</dt>
              <dd>January 2000–2012</dd>
            </dl>
            <dl class='sources_row'>
              <dt>Tree cover canopy density</dt>
  
negative.code:       <div class='source_header'>
          <strong class='source_title'>University of Maryland/Google tree cover loss</strong>
          <i class='expand_arrow'></i>
          <em class='source_description'>(annual, 30m, global)</em>
        </div>
  
        <div class='source_body'>
  