S

1. INTRODUCTION
Since early times,people have lit fires..
..but fires make smoke,and are not
convenient in modern homes.
The sun warms us
and gives us light
during the day .
At night , and
during the colder
months,we need
light and warmth
from other sources.
..and we also need heat for cooking.
The trouble is,this
makes lots of
‘greenhouse’gases
wich sientits belive
are warming up the
Earth and the air
arout it.
So what can
we do stop
global
warming ?
Removing 177,000 cars