I thought you all might like to have a look at P3, the Earth-based Magazine for Kids. It was published back in the 20th Century to give kids like you the power to act on behalf of their home planet.
Lots of information in it is still relevant BUT none of the names of politicians or activists or the addresses given for them are current. So please, don’t write to any of these people. Instead, check the KOTUS website for the people who are in charge now and write to them!