Change.org is an interesting organization. Subscribe and you will get daily promotions for all sorts of causes. If you want to support any particular one of them, you can sign a petition and/or contribute and/or pass the promotion along.
I am reticent to sign every petition that appeals to me. There is seldom enough information to make a considered judgement, and I don’t have the time in many cases to do any research. But some causes are pretty easy to support. And when you do and change happens, it feels – perhaps delusionally – that you’ve done good.