Individuals can help remedy the problem of pollution by recycling whenever possible. Recycling removes items from the waste stream. It may not seem like much, but if every person does it, it adds up to a tremendous reduction in the production of waste materials. Groups can capitalize on the power of numbers; a corporation that implements pollution reduction policies and procedures can have hundreds to thousands of times the impact of a single individual person. Political pressures can be brought to bear on governments by groups that advocate for anti-pollution legislation and regulation. Sometimes the bad press brought on by a protest that is covered in the media can be just as effective as passing a new law.
Pollution is not necessarily entirely man made. Periodically, algae blooms cause a "red tide" and make shellfish inedible for humans, for example. If you're specifically commenting on man made pollution, that is all a function of industrial processes. Restrictive legislation or a "green" political agenda will not solve this problem; it is not a problem of politics, but of technology. Certainly governments can act to restrict environmentally damaging practices, but this is merely a short term solution. The long term solution that'll solve the problem will happen when better industrial processes are in place. These cannot be effectively politically mandated; they must come from developing research.
The ultimate solution to pollution is a worldwide reduction in population, which even now is occuring as the most populous countries begin to fully industrialize.
To stop pollution from getting worse, it has to be a group effort that leads to corporation from stopping their methods of pollution. Most likely, this will require a powerful push from all people in every strata of society. It will also have to be a global initiative. If we do this, then I think we can make great strides. The whole green platform may just be able to do it. If there is much money to be made in the green movement, then corporations will go this direction, even if they don't really care about the environment, because of the potential for profit.
Certainly, another way human created pollution can be decreased would be to ensure that all possible wasteful exercises could be minimized. There are times when businesses and individuals engage in practices that demonstrate excessive pollution. If such actions can be monitored and such behavior discouraged, perhaps the overall and cumulative effect of pollution can be decreased.
The only way to completely stop pollution would be to completely stop the amount of smog that goes into the air, which is impossible. However, we can do our best to lessen the amounts of pollution that goes into the air, but never be able to stop it completely.