What springs to your mind when you hear the word “ technology”

'environment technology'
We have been living in polluted earth. It is a result from human's indifference for the nature.
However, nowadays lots of scientists make an effort to restore the polluted earth around the world.
To restore our earth, we need to develop the technology.
For example, the cars use the fuel refined from the petroleum and it generates the exhaust which is the main reason of the air pollution.
Therefore, to recover the air polluted, a development for the solar energy, hydrogen energy and so on is needed.= Therefore, to recover the polluted air, a development for the solar energy, hydrogen energy and so on are needed.
Beside that, in order to prevent the water pollution and geological pollution, lots of alternative energies should be developed by environment technology. But what is important is the effort by individuals for the protection of environment.