By comparing the cost of the 19th Century revolution in sanitation to the future cost of a clean energy system, Richard Alley says we can afford to make the change.
4 - 12+
Social Studies, World History
The audio, illustrations, photos, and videos are credited beneath the media asset, except for promotional images, which generally link to another page that contains the media credit. The Rights Holder for media is the person or group credited.
September 27, 2022
For information on user permissions, please read our Terms of Service. If you have questions about licensing content on this page, please contact firstname.lastname@example.org for more information and to obtain a license. If you have questions about how to cite anything on our website in your project or classroom presentation, please contact your teacher. She or he will best know the preferred format. When you reach out to him or her, you will need the page title, URL, and the date you accessed the resource.
If a media asset is downloadable, a download button appears in the corner of the media viewer. If no button appears, you cannot download or save the media.
Text on this page is printable and can be used according to our Terms of Service.
Any interactives on this page can only be played while you are visiting our website. You cannot download interactives.