Hi Dayo, every citizen can help. Some options are:
* Take public transportation, bike, or walk as much as possible
* Carpool to school, work or play
* Change your lightbulbs to the energy efficient ones
* Turn your thermostat down to about 68F Turn lights off when not in a room
* Open windows to let natural light in rather than artificial light
* Shutdown your computer when not in use, putting it on sleep still uses energy as it is on stand by
* Buy fruits and vegetables that are in season, or even produced in your country/state/province Take showers not baths, as baths require more water, in addition take only 5-10 minute showers
* Pack lunches in re-usable containers, do not use plastic bags or plastic utensils
* If you are up to it become a vegetarian