Four letters you should know.

Join the fight to protect the Land and Water Conservation Fund.

The Land and Water Conservation Fund (LWCF) has been the budgetary lifeblood for parks and open space in the United States for 50 years. Established by Congress in 1965, it aims to protect the nation's most iconic landscapes—and expand access to outdoor recreation—without taxing everyday Americans.

LWCF uses a portion of oil companies' revenue from offshore drilling to safeguard open space for the public. Under the law, LWCF can receive up to $900 million in offshore gas and drilling revenue every year. But over time, Congress has diverted billions of dollars to other purposes—leaving it chronically and severely underfunded.

The administration's budget proposes an 84 percent cut to LWCF—and the fund will expire altogether in 2018 unless Congress acts. The future of America's public lands is at risk. Here are four ways you can help.

What's at stake

Wherever you go to get outside, chances are some of your favorite places were protected thanks to LWCF. The fund has been used to conserve land in all 50 states and complete more than 41,000 state and local park projects—everything from historic sites and cultural landmarks to the forests and lakes where you go to camp, hike, fish, and explore.

Here are just a few recent projects whose success depends on LWCF.

The Trust for Public Land combines these federal funds with your donations to help protect the places that matter most. The end of LWCF would have serious consequences—not just for the national parks we all treasure, but for neighborhood open space in communities across the country.

Help sustain our fight on Capitol Hill to save the Land and Water Conservation Fund—become a monthly donor today.