The main threats, the exhaust gases that every day we are releasing into the atmosphere and thus worsen our air, the trees do not have time to clean the air, and lately they are fewer in gorodah.Kazhdy person can help all people in the world if something does not go far on the machine, such as a bicycle, not zagryaznyach air, people can often be clean, because the soil does not have time to rot, many veschi.I ultimately each of us can help the planet, if you just plant and grow a tree unnecessarily. it will clear the air
