The Wayback Machine is most effective if you have a url, for example: http://www.epa.gov or http://epa.gov/climatechange/index.html or https://www.whitehouse.gov/energy/climate-change.
Enter the url and choose the date you need.
Another option is to try the Search Box on the right side of the main page. Once you do a search, you'll be given Advanced Search options to help you focus your search. Using the Wayback Machine contains useful search tips.
EDGI is an active network of academics and non-profits building online tools and research networks to proactively archive public environmental data and ensure its continued public availability. Use the Internet Archive or perhaps DataRefuge for searching information that has been archived through the efforts of EDGI,
Hosted by Columbia Law School's Sabin Center for Climate Change Law, the Climate Regulation Database contains archived copies of Obama-era climate change regulations, policy documents, guidance documents, and supporting materials such as regulatory impact statements, environmental impact statements, and other supplemental studies. It organizes all of these materials by agency and topic.
The Georgetown Climate Center is collecting and archiving federal climate resources in the Clearinghouse. Resources direct users to archived links or provide access to an archived link at the bottom of the resource summary. You can search by keyword or by agency.