Ohio Chapter of the Sierra Club
The Ohio Chapter of the Sierra Club, a wonderful organization whose members work to save the earth and protect its wildlife. Their site has a wealth of information and helpful green resources.
http://ohiosierraclub.org/

Ohio Department of Natural Resources
The Ohio Department of Natural Resources works hard to manage and conserve the natural resources of the state of Ohio by monitoring hunting, fishing, mining, etc. This website lists a multitude of recreational activities in the natural environment, hunting/fishing license and registration regulations and conservation programs.
http://www.dnr.state.oh.us/

Ohio Environmental Protection Agency
The Ohio EPA strives to inspire responsible, green practices in regards to the environment and our natural resources while enforcing and creating environmental laws and providing education to the residents of Ohio on green matters.
http://www.epa.ohio.gov/

Ohio Air Quality Development Authority
This organization is working to reducing pollution in Ohio in an effort to conserve air as a natural resource. They provide information and assistance for businesses as well as those interested in alternative, green fuel choices.
http://www.ohioairquality.org/default.asp

Ohio PIRG
The Ohio Public Interest Research Group website.
http://www.ohiopirg.org/

Oklahoma Chapter of the Sierra Club
The Oklahoma Chapter of the Sierra Club, a wonderful organization whose members work to save the earth and protect its wildlife. Their site has a wealth of information and helpful green resources.
http://oklahoma.sierraclub.org/

Oklahoma Conservation Commission
Oklahoma Conservation Commission puts forth an effort to conserve and replenish the state of Oklahoma's natural resources to provide those who inhabit the state with a better quality of life.
http://www.ok.gov/conservation/

Oklahoma Department of Environmental Quality
This government agency is working in Oklahoma to conserve water, land and air resources to promote a healthier environment for the residents of Oklahoma.
http://www.deq.state.ok.us/

Onsite Wastewater Treatment and Reuse
A comprehensive and informative resource on wastewater management by Texas A&M.
http://ossf.tamu.edu/index.html

Open-Grid Paving Systems – Permeable Pavement
An overview on permeable pavement; different types and their benefits.
http://www.toolbase.org/Technology-Inventory/Sitework/permeable-pavement

Oregon Chapter of the Sierra Club
The Oregon Chapter of the Sierra Club, a wonderful organization whose members work to save the earth and protect its wildlife. Their site has a wealth of information and helpful green resources.
http://oregon.sierraclub.org/

Oregon Department of Environmental Quality
Oregon Department of Environmental Quality puts forth the effort to protect Oregon's environment by leading its citizens in preserving the state's natural resources.
http://www.oregon.gov/DEQ/index.shtml

Oregon Department of Fish and Wildlife
This government agency helps the residents of Oregon to protect indigenous wildlife and their habitats. Their website discusses the wildlife available in the state of Oregon and provides ways in which people can get involved in their protection.
http://www.dfw.state.or.us/

Oregon PIRG
The website for the Oregon Public Interest Research Group.
http://www.ospirg.org/

Organic Consumers Association
A non-profit organization that advocates for the health of both people and the environment. An extensive resource on all things organic – food, clothes, etc.
http://www.organicconsumers.org/

Organic Trade Association
The Organic Trade Association, the North American trade association committed to the promotion of organic products in the marketplace, and the protection of the integrity of organic standards.
http://www.ota.com/
http://www.organicitsworthit.org/

Ozone Layer Phaseout
EPA's website on the ozone layer, the rate at which it's depleting and what we can do to stop it.
http://www.epa.gov/Ozone/science/sc_fact.html