What is Global Warming?

What is global warming?
 
Global warming is when the earth heats
up (the temperature rises).  It
happens when greenhouse gases
(carbon dioxide, water vapor, nitrous
oxide, and
methane) trap heat and light from the sun
in the earth's atmosphere, which
increases the temperature.  This hurts
many people, animals, and
plants.  Many cannot take the change, so
they die.
What is the greenhouse effect?
 
The greenhouse effect is when the
temperature rises because the sun's heat
and light is trapped in the earth's
atmosphere.  This is like when heat is
trapped in a car. On a very hot day, the
car gets hotter when it is out in the
parking lot.  This is because the heat and
light from the sun can get into
the car, by going through the windows,
but it can't get back out.  This is
what the greenhouse effect does to the
earth.  The heat and light can get
through the atmosphere, but it can't get
out.  As a result, the temperature
rises.
 
 
The sun's heat can get into the car
through the windows but is then
trapped.  This makes what ever the place
might be, a greenhouse, a car, a
building, or the earth's atmosphere,
hotter.
Sometimes the temperature can change
in a way that helps us.  The
greenhouse effect makes the earth
appropriate for people to live on. 
Without it, the earth would be freezing, or
on the other hand it would be
burning hot.  It would be freezing at night
because the sun would be
down.  We would not get the sun's heat
and light to make the night somewhat
warm.  During the day, especially during
the summer, it would be burning
because the sun would be up with no
atmosphere to filter it, so people, plants,
and animals would be exposed to all the
light and heat.
 Although the greenhouse effect makes
the earth able to have people living
on it, if there gets to be too many gases,
the earth can get unusually warmer,
and many plants, animals, and people
will die.  They would die because
there would be less food (plants like corn, wheat, and other vegetables and
fruits).  This would happen because the
plants would not be able to take
the heat.  This would cause us to have
less food to eat, but it would also
limit the food that animals have.  With
less food, like grass, for the
animals that we need to survive (like
cows) we would even have less food. 
Gradually, people, plants, and animals
would all die of hunger. (By Lisa-P)