diff --git a/cmd/actions.go b/cmd/actions.go
index d97cc1f0..f52d78aa 100644
--- a/cmd/actions.go
+++ b/cmd/actions.go
@@ -42,6 +42,7 @@ const (
 	actionParamDiff
 	actionParamList
 	actionParamSet
+	actionParamUnset
 	actionPkgDescribe
 	actionPkgInstall
 	actionPkgList
@@ -79,6 +80,7 @@ var (
 		actionModuleList:   actions.RunModuleList,
 		// actionParamDiff
 		actionParamDelete:       actions.RunParamDelete,
+		actionParamUnset:        actions.RunParamDelete,
 		actionParamList:         actions.RunParamList,
 		actionParamSet:          actions.RunParamSet,
 		actionPkgDescribe:       actions.RunPkgDescribe,
diff --git a/cmd/param_delete.go b/cmd/param_delete.go
index a3364196..9724edf1 100644
--- a/cmd/param_delete.go
+++ b/cmd/param_delete.go
@@ -28,7 +28,7 @@ var (
 )
 
 var paramDeleteCmd = &cobra.Command{
-	Use:   "delete <component-name> <param-key>",
+	Use:   "delete [component-name] <param-key>",
 	Short: paramShortDesc["delete"],
 	RunE: func(cmd *cobra.Command, args []string) error {
 		var name string
diff --git a/cmd/param_delete_test.go b/cmd/param_delete_test.go
index 0e95765c..5dc47cf1 100644
--- a/cmd/param_delete_test.go
+++ b/cmd/param_delete_test.go
@@ -24,7 +24,7 @@ import (
 func Test_paramDeleteCmd(t *testing.T) {
 	cases := []cmdTestCase{
 		{
-			name:   "in general",
+			name:   "with a component",
 			args:   []string{"param", "delete", "component-name", "param-name"},
 			action: actionParamDelete,
 			expected: map[string]interface{}{
@@ -35,6 +35,18 @@ func Test_paramDeleteCmd(t *testing.T) {
 				actions.OptionIndex:   0,
 			},
 		},
+		{
+			name:   "without a component",
+			args:   []string{"param", "delete", "param-name", "--env", "default"},
+			action: actionParamDelete,
+			expected: map[string]interface{}{
+				actions.OptionApp:     ka,
+				actions.OptionName:    "",
+				actions.OptionPath:    "param-name",
+				actions.OptionEnvName: "default",
+				actions.OptionIndex:   0,
+			},
+		},
 	}
 
 	runTestCmd(t, cases)
diff --git a/e2e/param_test.go b/e2e/param_test.go
index 592296c3..7012a3ec 100644
--- a/e2e/param_test.go
+++ b/e2e/param_test.go
@@ -74,6 +74,23 @@ var _ = Describe("ks param", func() {
 				assertOutput("param/delete/env.txt", o.stdout)
 			})
 		})
+
+		FContext("removing environment global", func() {
+			BeforeEach(func() {
+				o := a.runKs("param", "set", "department", "engineering", "--env", "default")
+				assertExitStatus(o, 0)
+			})
+
+			JustBeforeEach(func() {
+				o := a.runKs("param", "delete", "department", "--env", "default")
+				assertExitStatus(o, 0)
+			})
+
+			It("removes the value", func() {
+				o := a.paramList("--env", "default")
+				assertOutput("param/delete/env-global.txt", o.stdout)
+			})
+		})
 	})
 
 	Describe("list", func() {
@@ -124,6 +141,18 @@ var _ = Describe("ks param", func() {
 
 			})
 		})
+
+		FContext("setting environment global", func() {
+			JustBeforeEach(func() {
+				o := a.runKs("param", "set", "department", "engineering", "--env", "default")
+				assertExitStatus(o, 0)
+			})
+
+			It("sets the value", func() {
+				o := a.paramList("--env", "default")
+				assertOutput("param/set/env-global.txt", o.stdout)
+			})
+		})
 	})
 
 })
diff --git a/e2e/testdata/output/param/delete/env-global.txt b/e2e/testdata/output/param/delete/env-global.txt
new file mode 100644
index 00000000..d69c4bc5
--- /dev/null
+++ b/e2e/testdata/output/param/delete/env-global.txt
@@ -0,0 +1,10 @@
+COMPONENT    INDEX PARAM         VALUE
+=========    ===== =====         =====
+guestbook-ui 0     containerPort 80
+guestbook-ui 0     env-value     2
+guestbook-ui 0     image         "gcr.io/heptio-images/ks-guestbook-demo:0.1"
+guestbook-ui 0     local-value   1
+guestbook-ui 0     name          "guestbook-ui"
+guestbook-ui 0     replicas      1
+guestbook-ui 0     servicePort   80
+guestbook-ui 0     type          "ClusterIP"
diff --git a/e2e/testdata/output/param/set/env-global.txt b/e2e/testdata/output/param/set/env-global.txt
new file mode 100644
index 00000000..eeca1080
--- /dev/null
+++ b/e2e/testdata/output/param/set/env-global.txt
@@ -0,0 +1,9 @@
+COMPONENT    INDEX PARAM         VALUE
+=========    ===== =====         =====
+guestbook-ui 0     containerPort 80
+guestbook-ui 0     department    "engineering"
+guestbook-ui 0     image         "gcr.io/heptio-images/ks-guestbook-demo:0.1"
+guestbook-ui 0     name          "guestbook-ui"
+guestbook-ui 0     replicas      1
+guestbook-ui 0     servicePort   80
+guestbook-ui 0     type          "ClusterIP"