We can do lots of things, such as drive hybrid vehicles, use solar panels, and use alternative fuels.
The greenhouse effect cause, because of increase in heat trapping gases including Carbon dioxide CFCs & nitrogen. We can reduce greenhouse effect by stop or decrease in use of those instruments which emit these gases.
We can do many things to help, like;
Use less electricity, Ride your bike, and more.
But we don't want to eliminate the Greenhouse effect all in all, we have to have it. If we didn't have, or never did; the Earth's surface would be about 30 degrees Celsius colder. That would not work for our ecosystem that we are attained to now.
can help slow global warming by:
Walking, riding your bicycle, or taking the bus instead of always going by car.
Not wasting electricity (turn off the lights, the radio, the TV and the computer when you're not using them).
Reducing, reusing or recycling all kinds of items, from soda pop cans to clothes, to save energy and raw materials.
Planting trees to help absorb excess CO2, and to provide shade and windbreaks to keep buildings at more even temperatures so they will require less energy for heating or cooling.