UNTIL RECENTLY THE PLANET WAS A LARGE WORLD IN WHICH PEOPLE AND NATURE WERE IN BALANCE. THE PEOPLE DIDN'T POLLUTE NATURE.
BUT NOWADAYS , ENVIRONMENTAL PROBLEMS ARE THE MOST IMPORTANT FOR US. IN MY CITY THERE ARE ENVIRONMENTAL PROBLEMS TOO . PEOPLE CUT DOWN TREES, DESTROY ANIMALS , AND , OF COURSE, THERE ARE PLANTS AND FACTORIES .
EVERY PERSON MUST NOT THROW A RUBBISH IN STREET. THEY MUST NOT DESTROY ANIMALS AND PLANTS. THEY MUST GROW A MORE TREES, BECAUSE THEY MAY CLEAN OUR AIR