And it can limit the need for chemical fertilizers by letting animal waste do the job of natural fertilizer.

VOA: special.2010.01.19

Plants naturally take in carbon dioxide they need for photosynthesis, the process of changing light energy to chemical energy.

VOA: special.2010.01.26

Yet sleep scientist Ying-Hui Fu at the University of California, San Francisco,says little is known about the basic need for sleep.

VOA: special.2009.08.26

Still,it says, there is an immediate need for the international community to continue and increase its investment in the fight against malaria.

VOA: special.2010.04.20

On the Thai Freedom House Web site, she says she recognized a need for education for Burmese street children in Chiang Mai.

VOA: special.2010.05.03

They teach the need for farming to improve the environment and make good use of natural resources.

VOA: special.2009.04.14

It was a bitter defeat. But it made the North recognize the need for a real army one trained and equipped for war.

VOA: special.2009.08.27

This form of grazing can reduce the need for pesticide treatments by reducing the growth of weeds.

VOA: special.2010.01.19

The genetically engineered cotton is designed to help farmers save money by decreasing the need for poisons.

VOA: special.2010.05.25

The hunger for news of the Civil War in the eighteen sixties increased the need for reporters.

VOA: special.2009.04.20

As America grew and white settlers moved west, many felt a great need for good transportation.

VOA: special.2009.04.23

As the nation's need for steel grew, bigger ships were built to carry iron ore.

VOA: special.2009.11.11

HTML 5 is being designed to use video without the need for extra software,like Flash.

VOA: special.2010.06.22

He stopped in many places to speak about the need for the League of Nations.

VOA: special.2010.11.18