The previous answer is excellent (as usual). Anything that can be done to use less energy will be helpful to some degree. Ideally, we should pursue alternative forms of energy, such as solar, wind, and wave. Recent developments in the use of ocean waves to generate energy seem very promising. Apparently the British plan to build a complex of wave generators in the not too distant future.
The main thing that you can do is to use less energy. That means that you should drive less (if possible) and use less electricity. Depending on what sorts of habits you have, this might be pretty easy. You can turn off lights that you don't need. You can stop making your house quite so warm in the winter and cool in the summer. You can be more careful about only driving when necessary. Of course, individual actions will have no effect on global warming, but if everyone does these things, change can happen.
don't drive so much!
to reduce green house effect in a large scale ... i hav organised many awareness camps in my village so that people get aware about it and will try to reduce the use of non renewable sources of energy to some extent...
The reduction in use of fossil fuel, reduction in energy consumption and use of alternative energy sources as given in the previous comments are the basic factors to reduce green house gas effects. In addition to above, a significant reduction can be made by bringing about a change in life-style, self restraint and discipline. This may require the following:
Using public transport for commuting long distances by individuals where the situation permits
spending more time in activites like playing outdoor games in the neighbourhood, devoting some time to walk and gardening
If we become more responsible citizens and start caring about others, not only as a nation but a part of the global community, the green house gases production can be tremendously reduced. Americans tend to be too selfish a nation in this regard. A large proportion of the total global quantity of green house gases is produced in US by use of fossil fuel whereas other parts of the world are discouraged to use the same.