Open government documents are useful for gaining global and national context for environmental standards and actions. These documents are open to the public, and accessible anywhere you can find an internet connection.
Here is a resource with access to Open Government Documents for Environmental Research: https://www.epa.gov/data
IPCC stands for International Panel on Climate Change. This panel is organized by the united nations and puts out regular reports on their findings as well as all of their meetings and work through digital documentation.
UNSDG stands for the United Nations Sustainable Development Goals. The sustainable development goals are internationally recognized and set by global leaders towards the goal of progress by the year 2030. These 17 goals cover a range of different topics such as an end to poverty, and a reduction of inequality throughout the world but are made up of many goals oriented towards a cleaner environment which are intertwined in many parts of the various goals. Specific to the environment are the following goals:
EPA stands for environmental protection agency.
Open Access Journals for Environmental Engineering: https://www.omicsonline.org/open-access-environmental-engineering-articles.php
All articles published by MDPI are made immediately available worldwide under an open access license. This means:
https://www.mdpi.com/openaccess