It is exciting to stand only a few meters away and watch scientists clean the asphalt off a fossil that is thousands of years old.

VOA: special.2010.04.07

Then wash it with clean water that is a little warm.

VOA: special.2010.08.02

Now UNESCO is warning the Lebanese government to clean up Qadisha or it could be removed from the World Heritage list.

VOA: standard.2010.08.05

"It is his anticipation that the Afghans are going to come to expect more from their government,expect clean and competent leadership from their government,"

VOA: standard.2009.11.12

"The sea grass is very important." "It filters the water, it keeps the water clean.

VOA: standard.2010.07.05

The single watt solar LED package works, Irvine-Halliday told Capitol Hill staffers at a recent meeting in Washington,because it is affordable, clean and easy to set up and maintain.

VOA: standard.2009.12.13

In a speech at Carnegie Mellon University, President Obama referred to the Gulf oil spill in making the case that it is time, as he put it, to "aggressively accelerate the nation's transition to a clean energy economy."

VOA: standard.2010.06.14

Earlier Friday, BP's incoming CEO Bob Dudley, said it is time to scale down the vast operation to clean up the Gulf of Mexico oil spill, but he stressed his company's commitment to fully restore the environment.

VOA: standard.2010.07.31