Show posts for current taxonomy

From the above query, it seems that you have passed wrong parameters in tax_query of your query.

It should be as follows:

'tax_query' => array(
       array(
           'taxonomy' => 'Themes', //Your custom taxonomy slug
           'field'    => 'slug', // this should be field name, not field value
           'terms'                => array('environment'),
           'include_children' => true,      
               'operator' => 'IN'  
       ),
   ),

Hope this will help you.