Recycling is one of the easiest and most common ways to go green. When making a poster about recycling for a science fair you should focus on the science behind recycling. Be sure to include hard numbers and facts about how recycling works and just how many resources it saves per year. Also mention what exactly people can and cannot recycle as well as what types of things are made from recycled materials.
Conserving energy, from electricity to natural gas, is another way to go green. If you want to make a poster about conserving energy, include information about how bringing energy sources like natural gas and electricity into our homes affects the environment. Be sure to mention ways to reduce our use of these resources by making simple changes such as turning off the lights when no one is in the room, switching to eco-friendly light bulbs, and not overusing heaters and air conditioners. You may also want to discuss energy alternatives like wind and water energy.
Water conservation is another important step in going green. To make a poster about water conservation, find information about how much water in your community is being wasted and the ways this affects the environment. Include common ways people waste water such as leaky faucets as well as solutions for these issues. You may also want to mention new technology such as home rainwater harvesting systems which collect rainwater and process it for use in the home.
The science behind hybrid cars makes an excellent poster topic and could include information about the environmental impact of lower emissions and the carbon footprint of making hybrid cars. You could also include information about alternative fuels such as bio-diesel and electric cars and how they can affect the environment. Finally, you could offer information about public transportation and how taking the bus or train instead of driving can help you go green.