If that is not possible, then clean off the equipment and your shoes when leaving.

VOA: special.2009.05.26

"If we had a clean energy economy powered by wind and solar and tidal power we probably would not be here having this discussion today."

VOA: standard.2010.07.31

She says that the goods and services provided by nature - like clean air, rain or fertile soils - should not be taken for granted.

VOA: standard.2010.02.24

"I am not someone who goes around thinking this has to be a clean government.

VOA: standard.2009.11.17

We have made a historic investment in clean energy, which will not only create the jobs of tomorrow, but will also lay the foundation for long-term economic growth.

VOA: standard.2010.04.25

Powering vehicles with clean natural gas is not new.

VOA: standard.2010.02.23

that's not our goal," "What our goal has to be is to advance the clean energy solutions in this country that can strengthen our economy, put people back to work, diversify our energy sources."

VOA: standard.2009.06.02

"The message is if you are not going to be clean and sincere, if you are going to engage in criminal activity, if you are going to cooperate with the Taliban, we will hold you accountable."

VOA: standard.2010.05.28