remove unused instances and disable constructor, see #339

js/common/view/GreenhouseGasConcentrationPanel.ts

@@ -31,7 +31,6 @@ import GreenhouseEffectConstants from '../GreenhouseEffectConstants.js';
 import ConcentrationModel, { ConcentrationControlMode, ConcentrationDate } from '../model/ConcentrationModel.js';
 import ConcentrationSliderSoundGenerator from './ConcentrationSliderSoundGenerator.js';
 import ConcentrationDescriber from './describers/ConcentrationDescriber.js';
-import RadiationDescriber from './describers/RadiationDescriber.js';
 import PickRequired from '../../../../phet-core/js/types/PickRequired.js';
 
 // constants
@@ -97,12 +96,10 @@ class GreenhouseGasConcentrationPanel extends Panel {
   /**
    * @param width - overall width of the panel
    * @param concentrationModel
-   * @param radiationDescriber
    * @param [providedOptions]
    */
   public constructor( width: number,
                       concentrationModel: ConcentrationModel,
-                      radiationDescriber: RadiationDescriber,
                       providedOptions?: GreenhouseGasConcentrationPanelOptions ) {
 
     const options = optionize<GreenhouseGasConcentrationPanelOptions, SelfOptions, PanelOptions>()( {
@@ -132,7 +129,6 @@ class GreenhouseGasConcentrationPanel extends Panel {
     // controls the concentration directly by value
     const concentrationControl = new ConcentrationControl(
       concentrationModel,
-      radiationDescriber,
       options.tandem.createTandem( 'concentrationControl' )
     );
 
@@ -363,7 +359,7 @@ class DateControl extends HBox {
  * Inner class representing a labeled vertical slider that directly controls greenhouse gas concentration.
  */
 class ConcentrationControl extends VBox {
-  public constructor( concentrationModel: ConcentrationModel, radiationDescriber: RadiationDescriber, tandem: Tandem ) {
+  public constructor( concentrationModel: ConcentrationModel, tandem: Tandem ) {
 
     const sliderRange = concentrationModel.manuallyControlledConcentrationProperty.range;
     const sliderSoundGenerator = new ConcentrationSliderSoundGenerator(

js/common/view/describers/RadiationDescriber.ts

@@ -9,7 +9,6 @@ import StringUtils from '../../../../../phetcommon/js/util/StringUtils.js';
 import greenhouseEffect from '../../../greenhouseEffect.js';
 import GreenhouseEffectStrings from '../../../GreenhouseEffectStrings.js';
 import GroundLayer from '../../model/GroundLayer.js';
-import LayersModel from '../../model/LayersModel.js';
 import TemperatureDescriber from './TemperatureDescriber.js';
 import { ConcentrationControlMode, ConcentrationDate } from '../../model/ConcentrationModel.js';
 import ConcentrationDescriber from './ConcentrationDescriber.js';
@@ -20,10 +19,13 @@ const sunlightStartedStringProperty = GreenhouseEffectStrings.a11y.sunlightStart
 const sunlightStartedSimPausedStringProperty = GreenhouseEffectStrings.a11y.sunlightStartedSimPausedStringProperty;
 
 class RadiationDescriber {
-  private readonly model: LayersModel;
 
-  public constructor( model: LayersModel ) {
-    this.model = model;
+  public constructor() {
+
+    // At the time of this writing (Aug 2023), there are only static usages of this type, so the constructor has been
+    // disallowed.  If state is ever needed, feel free to change this.  See
+    // https://github.com/phetsims/greenhouse-effect/issues/339.
+    assert && assert( false, 'Intended, at least originally, to only be used statically.' );
   }
 
   /**

js/photons/view/PhotonsScreenView.ts

@@ -10,7 +10,6 @@ import { VBox } from '../../../../scenery/js/imports.js';
 import Tandem from '../../../../tandem/js/Tandem.js';
 import GreenhouseEffectConstants from '../../common/GreenhouseEffectConstants.js';
 import GreenhouseGasConcentrationPanel from '../../common/view/GreenhouseGasConcentrationPanel.js';
-import RadiationDescriber from '../../common/view/describers/RadiationDescriber.js';
 import GreenhouseEffectScreenView from '../../common/view/GreenhouseEffectScreenView.js';
 import LayersModelTimeControlNode from '../../common/view/LayersModelTimeControlNode.js';
 import MorePhotonsCheckbox from '../../common/view/MorePhotonsCheckbox.js';
@@ -55,13 +54,10 @@ class PhotonsScreenView extends GreenhouseEffectScreenView {
       tandem.createTandem( 'morePhotonsCheckbox' )
     );
 
-    // Responsible for generating descriptions about the changing radiation.
-    const radiationDescriber = new RadiationDescriber( model );
-
     const greenhouseGasConcentrationPanel = new GreenhouseGasConcentrationPanel(
       this.energyLegend.width,
       model,
-      radiationDescriber, {
+      {
         includeCompositionData: true,
 
         // phet-io

js/waves/view/WavesScreenView.ts

@@ -12,7 +12,6 @@ import soundManager from '../../../../tambo/js/soundManager.js';
 import Tandem from '../../../../tandem/js/Tandem.js';
 import GreenhouseEffectConstants from '../../common/GreenhouseEffectConstants.js';
 import GreenhouseGasConcentrationPanel from '../../common/view/GreenhouseGasConcentrationPanel.js';
-import RadiationDescriber from '../../common/view/describers/RadiationDescriber.js';
 import EnergyLegend from '../../common/view/EnergyLegend.js';
 import GreenhouseEffectScreenView from '../../common/view/GreenhouseEffectScreenView.js';
 import LayersModelTimeControlNode from '../../common/view/LayersModelTimeControlNode.js';
@@ -88,13 +87,9 @@ class WavesScreenView extends GreenhouseEffectScreenView {
       model.concentrationControlModeProperty,
       tandem.createTandem( 'cloudCheckbox' ) );
 
-    // Responsible for generating descriptions about the changing radiation.
-    const radiationDescriber = new RadiationDescriber( model );
-
     const greenhouseGasConcentrationPanel = new GreenhouseGasConcentrationPanel(
       this.energyLegend.width,
       model,
-      radiationDescriber,
       {
 
         // phet-io