(CNN) Thousands of people face uncertain futures in Harvey's aftermath. There are several ways you can help.

Donate money: By clicking on the button below, you can donate to charities vetted by CNN's Impact Your World. These organizations are helping in Harvey's immediate aftermath, and they will continue working through the long term.

If you are in Texas, there are additional ways you can contribute:

Donate blood: The : The South Texas Blood & Tissue Center desperately needs more than 2,000 units of blood. The biggest need is for O positive and O negative. A list of locations to donate blood can be found here