diff --git a/aeromancer/requirements/alembic/versions/17770a76e3c7_add_global_requirement_table.py b/aeromancer/requirements/alembic/versions/17770a76e3c7_add_global_requirement_table.py
new file mode 100644
index 0000000..366ff45
--- /dev/null
+++ b/aeromancer/requirements/alembic/versions/17770a76e3c7_add_global_requirement_table.py
@@ -0,0 +1,30 @@
+"""add global_requirement table
+
+Revision ID: 17770a76e3c7
+Revises: 203851643975
+Create Date: 2014-11-12 12:58:13.309422
+
+"""
+
+# revision identifiers, used by Alembic.
+revision = '17770a76e3c7'
+down_revision = '203851643975'
+
+from alembic import op
+import sqlalchemy as sa
+
+
+def upgrade():
+    op.create_table(
+        'global_requirement',
+        sa.Column('id', sa.Integer, primary_key=True),
+        sa.Column('line_id', sa.Integer,
+                  sa.ForeignKey('line.id', name='fk_requirement_line_id')),
+        sa.Column('name', sa.String()),
+    )
+    pass
+
+
+def downgrade():
+    op.drop_table('global_requirement')
+    pass
diff --git a/aeromancer/requirements/cli.py b/aeromancer/requirements/cli.py
index b6e8db4..064d7a5 100644
--- a/aeromancer/requirements/cli.py
+++ b/aeromancer/requirements/cli.py
@@ -8,6 +8,8 @@ from aeromancer import utils
 
 from cliff.lister import Lister
 
+from sqlalchemy import distinct
+
 
 class List(Lister):
     """List the requirements for a project"""
@@ -53,3 +55,18 @@ class Uses(Lister):
         ).order_by(models.Project.name)
         return (('Name', 'Spec', 'File'),
                 ((r.project.name, r.line.content.strip(), r.line.file.name) for r in query.all()))
+
+
+class Unused(Lister):
+    """List global requirements not used by any projects"""
+
+    log = logging.getLogger(__name__)
+
+    def take_action(self, parsed_args):
+        session = self.app.get_db_session()
+        used_requirements = session.query(distinct(req_models.Requirement.name))
+        query = session.query(req_models.GlobalRequirement).filter(
+            req_models.GlobalRequirement.name.notin_(used_requirements)
+        ).order_by(req_models.GlobalRequirement.name)
+        return (('Name', 'Spec'),
+                ((r.name, r.line.content.strip()) for r in query.all()))
diff --git a/aeromancer/requirements/handler.py b/aeromancer/requirements/handler.py
index 00d5981..a3d96c9 100644
--- a/aeromancer/requirements/handler.py
+++ b/aeromancer/requirements/handler.py
@@ -2,8 +2,9 @@ import logging
 
 import pkg_resources
 
+from aeromancer.db import models as models
 from aeromancer.filehandler import base
-from . import models
+from aeromancer.requirements import models as req_models
 
 LOG = logging.getLogger(__name__)
 
@@ -37,7 +38,7 @@ class RequirementsHandler(base.FileHandler):
         parent_project = file_obj.project
         for dist_name, line in read_requirements_file(file_obj):
             LOG.debug('requirement: %s', dist_name)
-            new_r = models.Requirement(
+            new_r = req_models.Requirement(
                 name=dist_name,
                 line=line,
                 project=parent_project,
@@ -46,10 +47,33 @@ class RequirementsHandler(base.FileHandler):
 
     def delete_data_for_file(self, session, file_obj):
         LOG.debug('deleting requirements from %r', file_obj.path)
-        for line in file_obj.lines:
-            query = session.query(models.Requirement).filter(
-                models.Requirement.line_id == line.id
-            )
-            for req in query.all():
-                session.delete(req)
+        query = session.query(req_models.Requirement).join(models.Line).filter(
+            models.Line.file_id == file_obj.id
+        )
+        for r in query.all():
+            session.delete(r)
+        return
+
+
+class GlobalRequirementsHandler(base.FileHandler):
+
+    INTERESTING_PATTERNS = [
+        'global-requirements.txt',
+    ]
+
+    def process_file(self, session, file_obj):
+        LOG.info('loading global requirements from %s', file_obj.project_path)
+        parent_project = file_obj.project
+        for dist_name, line in read_requirements_file(file_obj):
+            LOG.debug('global requirement: %s', dist_name)
+            new_r = req_models.GlobalRequirement(
+                name=dist_name,
+                line=line,
+            )
+            session.add(new_r)
+
+    def delete_data_for_file(self, session, file_obj):
+        LOG.debug('deleting global requirements from %r', file_obj.path)
+        query = session.query(req_models.GlobalRequirement)
+        query.delete()
         return
diff --git a/aeromancer/requirements/models.py b/aeromancer/requirements/models.py
index c6871d2..b2535ea 100644
--- a/aeromancer/requirements/models.py
+++ b/aeromancer/requirements/models.py
@@ -19,3 +19,15 @@ class Requirement(models.Base):
         models.Project,
         backref='requirements',
     )
+
+
+class GlobalRequirement(models.Base):
+    __tablename__ = 'global_requirement'
+    id = Column(Integer, primary_key=True)
+    name = Column(String, nullable=False)
+    line_id = Column(Integer, ForeignKey('line.id'))
+    line = relationship(
+        models.Line,
+        uselist=False,
+        single_parent=True,
+    )
diff --git a/setup.cfg b/setup.cfg
index ee343a6..b74ae8d 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -56,7 +56,9 @@ aeromancer.cli =
     rescan = aeromancer.cli.project:Rescan
     discover = aeromancer.cli.project:Discover
     requirements list = aeromancer.requirements.cli:List
+    requirements unused = aeromancer.requirements.cli:Unused
     what uses = aeromancer.requirements.cli:Uses
 
 aeromancer.filehandler =
     requirements = aeromancer.requirements.handler:RequirementsHandler
+    global_requirements = aeromancer.requirements.handler:GlobalRequirementsHandler