Answer:
1. Reduce use of transportation.
2. Planting more plants and trees
Step-by-step explanation:
Ruducing uses of vehciles lessens the CO2 levels because the vehicles produce harmful gases which are then left in the air for hours. To do this you can use your bike or even walk to where you need to go instead of calling an unber.
Planting more plants and trees can reduce the amount of CO2 because plants get rid of CO2 through a process called carbon sequestration.