Donations
Money makes the world go round, they say, and in America money does talk with a very loud voice. While not everyone is able to donate to politicians, agencies, or organizations, those that can make a direct and influential impact. Although donations to politicians are limited by campaign finance laws, politicians are grateful for all the donations they receive, and there is tremendous political pressure to take into account the wishes of such supporters. Unfortunately, this opens the door for bribery and corruption and a number of unhealthy activities, but it also provides a way for you to make your voice heard in the clearest language government understands. Even if you don't have enough fund to donate directly to a campaign, there are many other ways to support groups that will in turn make the environmental issues you care about known to your senators and representatives.
While the world of donations can be a place of dangerous balance, there is also room for much good to be done! Remember, time and energy can be valuable donations, too. In politics, giving is very reciprocal--politicians will feel the need to give something back. Donating on Earth Day, donating to eco-friendly representation groups, and donating in response to your congressman's endorsement of particularly sound policies are only a few viable ideas.
Endorsement of "Green" Business
Not only does endorsing eco-friendly business product and practices help companies, but it also encourages a healthy cycle of government participation. The circle goes like this: governments, often under pressure from voters/taxpayers, put into motion policies that encourage green business by giving businesses tax deductions, subsidies, grants, and other forms of support. Businesses use this support to create eco-friendly products or use more environmentally sound materials, and take pains to advertise the fact and draw in eco-minded people. People who endorse these practices by buying the products or commenting on the companies' new directions encourage their governments to believe that such programs are successful and that more should be implemented.
Also, the simple use of green services and eco-products will eventually find its way back to the government through stats on consumer spending and economics, so the message finds its way in the end.
State Osmosis
Sometimes all it takes is one state to pass environmental legislation or endorse eco-friendly behavior, and soon other states are also jumping on the green bandwagon. Bordering states often cave into demand when one of their brothers takes action, moving under peer pressure or simple logic to mirror the decision. Before long, a whole chain of states can follow suit, and often the policies become federal legislation as well. As the public, we don't always need win over the whole country--at times just our state will do, and a dozen other states that were waiting for someone to make the move will join in.
An excellent example of this can be seen by looking at California. The west coast state, tending to be more proactive in ecological matters, signed at bill into law (with Governor Davis at the helm) in 2002 intended to reduce C02 emissions from automobiles. Although the law was criticized as being unfair and unhealthy for California's economy, in the following years a number of states over in New England, due to yet more provinces in nearby Canada making similar decisions, also passed their own versions of emission-lowering laws, including New Hampshire and Massachusetts. Together, the states were able to learn from each other and develop eco-friendly laws more fitting to their economies and manufacturing situations. The Kyoto Protocol is an example of how this can also happen internationally.
Demonstrations
Demonstrations are a two-edged sword. On one hand, they are a highly effective way to spread viewpoints and let other members of the public and government organizations (including politicians!) know what you think. The other hand is more negative: others may be turned off to your message if they find the demonstration annoying, while some radical demonstrations have broke the law or provoked unwholesome hostility. Unfortunately, demonstrations that end in disaster are often far more effective are winning the attention of both the government and other members of society, as seen with the death of David Chain.
So while demonstrations can cause swift action and unprecedented attention, they can also be dangerous, tending toward misunderstanding or chaos. When looking for a good model to follow, you may want to remember Julia Hill, who managed to negotiate protection for part of an old growth forest through her own radical demonstrations. An important side note, however: demonstrations also take a large amount of efficient organization to be effective! Be sure you plan ahead! Signs, flyers, and passion are all important ingredients, along with a good turnout--nothing makes politicians look twice like a large number of people.