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To build your knowledge about a topic that you are interested in, it's best to first consult popular/mainstream sources of information. These sources of information are directed at the general reading public and their purpose (usually) is to inform.
The links below will take you to freely available online popular/mainstream sources of information on issues in agriculture.
Great source of news about the environment. This is considered "scholarly" and "peer-reviewed" BUT many of the articles published are NOT original research articles. Make sure you are paying attention when using this as a source. Original Research articles will publish their sources.