You’re probably aware of the monumental decrease in funding the federal government has enacted with the latest budget cuts. If you don’t care about public broadcasting, here’s a picture of Yosemite.

If you’re looking to do something to help, there is a great resource called Adopt A Station.
Basically it is a website that shows how much all of the budgets of all the PBS stations have been cut. And then it gives a link to make a direct donation.
For instance, when I search for California, there are a lot of stations (big state) and most range from 4% loss to 20% loss. If you live in California, you can find your local station here.
But some have lost more than 40%, mainly in rural areas like Chico and Redding and Eureka.
Further, there is a section near the bottom of the page showing a semi-random station that has lost a large portion of its funding, somewhere in the US. I used this function to find three stations with what I considered large cuts and then went directly to their donation pages to donate.

Unfortunately this page isn’t a realtime update, so it’s not like your donation will be reflected on the main page as directly decreasing the budgetary shortfall.
That aside, the page is a good way to see what areas needs help and then allows you to directly help.