But even mulch has its limits. Natural resource specialists point out that weeds can be transported in mulch.

VOA: special.2010.08.10

In many countries there are a few natural bottlenecks, whether it be large data centers or right-of-ways."

VOA: special.2011.02.21

Natural resource specialists in the Queensland government in Australia note that weeds can be transported in mulch.

VOA: special.2009.05.26

Your body's natural defense system needs to be at its strongest to protect you against disease.

VOA: special.2009.04.29

The group says it could be hard to stop experimental organisms from entering the natural environment.

VOA: special.2010.07.20

Patients may be asked to identify smells like smoke, natural gas or fruits.

VOA: special.2009.09.15

Yarn can be made from natural materials such as cotton, linen,silk and wool.

VOA: special.2009.11.04

Some seeds will not be killed during the natural heating process in composting.

VOA: special.2009.06.23

And that if we want a positive earth for future generations, we all need to make commitments to be change agents so that we don't destruct our natural resources."

VOA: special.2010.01.21

"The dancer of the future will be one whose body and soul have grown so harmoniously together that the natural language of that soul will have become the movement of the body.

VOA: special.2010.08.29

And we've structured our own store where each vendor, which out of nine hundred I've only got currently about ten approved, that are willing to allow their material to be inspected, allow their growth facility to be inspected and be verified organic or natural growing techniques.

VOA: special.2010.10.11

"It could be hitting natural fractures that already exist." Fox notes that toxic gases like benzene,toluene and hexane also accompany natural gas extraction.

VOA: standard.2010.01.02

"So they have themselves experienced what it is like to be survivors of a devastating natural disaster."

VOA: standard.2009.10.12

By 2013,Lithuania wants to have a new natural-gas power plant, but experts caution that this will not be enough to meet the country's energy needs.

VOA: standard.2010.01.01