What do you listen to on NPR?

I read the news regularly, and today I finally decided to venture into NPR. However, there are so many different links and sections that I don’t know where to start. Could I get some recommendations on stations or podcasts?

My interests are in environment, journalism, humour, (some) politics, and news, so suggestions for your favourites in these categories would be wonderful… but any other suggestions would be appreciated as well!

Thanks!