A;oh!what a bad weather it is!It's sand storm.
B;yeah!resent years a mass of industry factory ignore the envirenment pollution ,and discharge smoke into the atmosphere makeing it dirty.
A;thay are really irresponsible!our heath is effected by the dirty air that we breath in everyday.
B;what is worse!Indiscriminate felling of trees will also destroy the ecological balance of nature.
A;oh no!we should take action to protect our environment which we live with.
B；you are right!I assum that first we should fully recognize the gravity of the issue--our globe is in danger now,
A;It is better to us to pretect our envirenment such as energe saving and insist on environment-friendly development .
B;I cannot agree more!