Image source: https://commons.wikimedia.org/wiki/File:Scholl_Canyon_Landfill_-_Glendale,_CA.jpg.
The links below are useful resources that will provide background information for your research.
An asterisk (*) stands in for any group of letters
FINDS: library, libraries, librarian
Quotation marks keep words together, and in order
“this is a phrase” this is not
'AND' narrows your search and 'OR' broadens your search (see below)
“methane emission” “landfill” “methane emission” “methane emission”
(fewer results) (more results)
Searching for synonyms of your keywords will ensure that you can find resources that are connected to your topic. Think through how else someone might refer to key concepts you are searching.
The databases below will be a good place to conduct literature searches to find peer-reviewed sources. You should search more than one database for a comprehensive search.
Google Scholar is search engine, not a database. It does not support advanced search functions or search strategies. It's good for finding individual citations, but less good for conducting research.
Grey literature is materials and research produced by organizations outside of the traditional commercial or academic publishing. These are considered good sources of information. Common information types include reports, working papers, government documents, white papers, etc. To find grey literature you will have to search individual websites and search engines.
The links below are a good starting point to find grey literature.