One of the best ways to help polar bears is by adopting one. Many major wildlife charities offer programs where you can adopt a polar bear and help support the charity in its effort to protect them
As the situation looks worse and worse for polar bears there are some people out there who are fighting back and doing all they can to protect polar bears and the arctic
One of the best ways you can help out is to adopt a polar bear or to donate to a wildlife charity. By adopting a polar bear and donating to a wildlife charity you are helping these organisations by giving them resources which allow them to then go out and do their work.
You can read more about polar bears here
Also check out polar bear endangered