air pollution
air pollution v.s. haelth
why we must fight air pollution
how to reduce air pollutants.
air pollution v.s. environment
protest to the government
for the people
CO2
cause of air pollution
for the Earth
nature sources
volcano eruption
allergens
breathe issue
biking the bike
reduce the number of death people
artificial
protection the Earth
heart disease
opting for the public transport system
wild fire
let greenhouse effect more badly
respiratory infection
smoking cigarette
promote environmental protection
dust storms
global warming
walking
smog(reduce visibility)
burning fossil fuels
2.4 million die each year
switching off lights,TV,computer
asthma
volcano eruption
birth defects
lung cancer
dust storms
The Earth is the only world known so far to harbor life.
saving energy
eye irritation