Large non-profit organizations aren’t the only groups that are able to do something meaningful for the natural world around us. You can start small, in your own garden, or you can volunteer in your community.
There are groups and organizations in every state that you can join in order to protect the parks and wild lands, but the Nature Conservancy acts as a great hub for easily finding volunteering opportunities near you.
If you visit their page for the United States, you can find your state on the left and discover fun ways to protect your community, be it trail maintenance, fundraising, or organizing.
So grab some hiking boots, gardening gloves, a spade, and start volunteering today: http://www.nature.org/ourinitiatives/regions/northamerica/unitedstates/index.htm