One of the most important things you can do if you want a healthy natural world is to get out and vote for candidates that have strong environmental values and who will act on those values.
To accomplish the large goals of affecting change when it comes to industrial pollution, preservation of open space, keeping our waterways clear and clean, reducing the impact of fossil fuels, promoting clean energy, and so forth, it can’t be done without political will and strength.
To get help on who to vote for, seek out organizations such as the Sierra Club that endorse candidates with strong environmental records and values. For candidates in local races, have discussions with individuals and friends who are involved in local politics, research voting records and even simply ask the candidates about their positions.
Finally, share your opinion to support the issues and each other, and most certainly cast an informed vote in every election.