Their findings could help to engineer plants that grow better and more effectively in conditions with higher levels of carbon dioxide.

VOA: special.2010.01.26

The agreement sets targets to prevent the Earth's average temperature from rising more than two degrees Celsius above pre-industrial levels.

VOA: special.2009.12.26

All agreed that global temperatures should not rise by more than an average of two degrees Celsius above pre-industrial levels.

VOA: special.2009.07.11

More than one thousand children living nearby were reported to have high levels of lead in their blood.

VOA: special.2009.08.31

The researchers said those with the highest level of cortisol were five times more likely to die from cardiovascular causes than those with the lowest levels.

VOA: special.2010.10.12

There are increasing demands that future development be more sensitive to rising sea levels and the threat of storm surges.

VOA: standard.2009.11.09

Scientists warn climate change will lead to rising sea levels, more devastating floods and hurricanes, longer lasting droughts and other extreme weather phenomena.

VOA: standard.2009.08.31

The study looked at leptin levels in more than 700 elderly adults who did not have dementia.

VOA: standard.2009.12.30

There are five different levels. And then you get more money as you reach the different levels.

VOA: standard.2010.07.16

The researchers studied US government nutritional data and fat levels in the blood in more than 6,000 adults for at least six years.

VOA: standard.2010.04.25

"With the high unemployment levels you want more job investment to come into the state,".

VOA: standard.2009.10.27

Obviously,unemployment at high levels means that there is more demand for public services,".

VOA: standard.2009.08.25

"But the hitch is now news coming out of Tehran, which suggests they may be actually looking to purchase at more highly enriched levels up to 20 percent.

VOA: standard.2009.10.19

We're talking about more natural disasters, increased levels of disease.

VOA: standard.2009.11.06

So working with the government of Morocco,we are hoping to really help to see blossom a lot more economic activity at the lower levels that will then from the bottom-up build prosperity,"

VOA: standard.2009.11.03

Thai economists are warning Thailand's unemployment levels could reach 1.3 million people this year, more than double the530,000 people who lost their jobs last year when the unemployment rate stood at 1.4 percent.

VOA: standard.2009.03.09

This report is about the latest effort to reduce the record and rising casualty levels among U.S.troops in Afghanistan, as President Barack Obama considers sending tens of thousands more troops into harm's way.

VOA: standard.2009.11.02

The male brains, especially nerve cell rich parts of the brain associated with thinking and remembering, seemed to have sustained more long term damage from high lead levels than the brains of the young women.

VOA: standard.2009.12.19

After returning from a trip to Afghanistan, Senator Daniel Inouye, who heads the powerful Senate Appropriations Committee, issued a statement this week appearing to support the request by General McChrystal for more troops, although Inouye said more discussion would be needed before any final decision on troop levels is made.

VOA: standard.2009.10.15