Prevent natural problems

　These days, all of the world mass media focus on climate
change and a natural disaster. For example, global warming,
forest fire and an earthquake. These problems are caused by
people. For a long time, we commit a fault. We cut down many
trees, so it causes global warming and air pollution. We use gas,
oil and coal, these are finite and caused pollution. But if we make
good use of alternative energy, we'll can prevent natural disaster
and progressing air pollution. The solar calender, velocity of the
wind, water power and tidal power are alternative energy. All of
the world, scientists develop and study hard. Also, we should use
public transportation and control ourself using the spray.