Sentences with phrase «levels of carbon dioxide»

... A particular concern is that atmospheric levels of carbon dioxide may be rising faster than at any time in Earth's history, except possibly following rare events like impacts from large extraterrestrial objects.

Over 400,000 years, levels of carbon dioxide have risen and fallen, varying from colder in the Ice Ages to warmer in interglacial periods.

Severe conditions caused rainforest to suck in lower levels of carbon dioxide, raising concern over future climate impacts

The Leipzig Declaration stats that «there does not exist today a general scientific consensus about the importance of greenhouse warming from rising levels of carbon dioxide.»

• As a result of increased levels of carbon dioxide and other greenhouse gases, global temperatures have increased.

Global Warming • As a result of increased levels of carbon dioxide and other greenhouse gases, global temperatures have increased.

In 1992, a team from the University of New Mexico reported that ancient soils showed extremely high levels of carbon dioxide 440 million years ago, an age of primitive sea life before the advent of land plants and animals.

And that's despite increasing levels of carbon dioxide in the air.

The pattern is linked to the rising and falling levels of carbon dioxide in the air, which traps heat.

Climate is changing, forced out of the range of the past million years by levels of carbon dioxide and other greenhouse gases not seen in the Earth's atmosphere for a very, very long time.

However, since around the middle of the 18th Century, human activity affecting the levels of carbon dioxide in the atmosphere has rapidly increased.

How could that be given that for most of the past 600 million years, the planet has been much warmer than today, with much higher levels of carbon dioxide than today?

Expertise in the effects of high levels of carbon dioxide on astronauts doesn't make one an expert on CO2 «s effect on ecosystems.

This year, the planet passed a dangerous milestone when atmospheric levels of carbon dioxide exceeded 400 parts per million, prompting the scientific community to advocate renewed vigour in efforts to combat climate change, and the UNFCCC's Executive Secretary to call...

Only over climate timescales (typically, 30 years or more), do the long - term trends emerge that reflect the influence of changes in atmospheric levels of carbon dioxide.»

In this new study scientists from Germany, Norway, France and the UK used four different computer models that mimic the earth's climate to see how they responded to increased levels of carbon dioxide coupled with reduced radiation from the sun.

And the culprit that tried to cool the planet in spite of ever - rising levels of carbon dioxide in the atmosphere?

For more than a century, climate scientists have known that higher levels of carbon dioxide in the atmosphere mean higher atmospheric temperatures.

Beer followed up his study in 1995, but this time used more sophisticated modelling to look at how fire danger changed as levels of carbon dioxide in the atmosphere went up.

Current levels of carbon dioxide concentration in the environment are substantially lower than they have been during earlier periods in the planet's history.

Anthony Watts is listed as a signatory on the «Leipzig Declaration», which said «there does not exist today a general scientific consensus about the importance of greenhouse warming from rising levels of carbon dioxide.

«In addition to causing changes in climate, increasing levels of carbon dioxide from the burning of fossil fuels and other human activities have a direct affect on the world's oceans,» the report found, particularly an increase in levels of acidity, which it said are a threat to marine life.

Rising levels of carbon dioxide in Earth's atmosphere will cause significant changes to ocean temperatures and chemistry over the next 100 years, thereby increasing the frequency and severity of mass bleaching and other stresses on coral reefs and reef systems, scientists say.

A much wiser approach would be to allow the US market for electricity to determine whether more or fewer solar panels are needed without any subsidies or coercion since the basis for fearing catastrophic effects from increasing levels of carbon dioxide is scientifically invalid.

Ragweed pollen growth, stimulated by increasing levels of carbon dioxide, may be contributing to the rising incidence of asthma, the scientists say.

They then studied the levels of carbon dioxide stored in the ponds and the rate at which another greenhouse gas, methane, is released.

a consequence of rising levels of carbon dioxide in the atmosphere in response to the increasing combustion of fossil fuels.

But they are still arguing over inconsistencies in data over that period, and the cycles» relationships to rising and falling levels of carbon dioxide, the other apparent master climate control.

Rising levels of carbon dioxide (CO2), along with other greenhouse gases, indirectly alter the climate system by trapping heat as it is reflected back from the Earth's surface.

There is now widespread agreement among climate scientists that the earth is warming as a result of human activity, primarily due to rising levels of carbon dioxide and other heat trapping atmospheric gases created by burning fossil fuels.

In the report (PDF), which recants many of the popular skeptical arguments regarding climate change, Schwartz claims that [Al] «Gore's brand of over-the-top climate hysteria has nothing to do with reality,» and that «Most of the greenhouse effect is natural and is due to water vapor naturally in the atmosphere, as well as natural levels of carbon dioxide (CO2), methane, and a few other greenhouse gases.»

The declaration states that ``... it has become increasingly clear that — contrary to the conventional wisdom — there does not exist today a general scientific consensus about the importance of greenhouse warming from rising levels of carbon dioxide.

He said scientists have been able to correlate changes in atmospheric temperature with changes in levels of carbon dioxide going back more than 500,000 years by analyzing ice core samples and the CO2 bubbles trapped inside.

we do have a stake, a vested interest in making sure that carbon dioxide in the atmosphere does not fall to low levels... High levels of carbon dioxide should not concern us.

HIPPO also should help to understand how the classification and augmentation of northern boreal forests and tropical rain forests affect levels of carbon dioxide in the atmosphere.

«This will help improve how we look after our waters — and will allow us to better predict how oceans will react in the future to a changing climate with increasing levels of carbon dioxide in the atmosphere.»

Pre-industrial levels of carbon dioxide refers to carbon dioxide concentration in the atmosphere prior to the start of the Industrial Revolution.

The widespread belief that AGW is the fundamental cause of present - day climate change is predicated on the apparent correlation between rising levels of carbon dioxide and the increase in mean global temperature over the past two centuries.

16 Scientists that think that an increase in carbon dioxide is a major factor in global warming Until the late 1800s carbon dioxide in the atmosphere remained about the same Measured carbon dioxide levels in bubbles trapped in Antarctic ice CHANGING LEVELS OF CARBON DIOXIDE

The higher levels of carbon dioxide in the atmosphere could spur mold to grow more allergenic proteins, exacerbating people's response to the fungus, new research finds.

Easterbrook's predictions were «right on the money» seven years before Al Gore and the United Nation's Intergovernmental Panel on Climate Change (IPCC) shared the 2007 Nobel Peace Prize for warning that the Earth was facing catastrophic warming caused by rising levels of carbon dioxide, which Gore called a «planetary emergency.»

Keeling was a joke, in less than two years of «data gathering» he claimed to have shown a trend and concluded that man - made levels were rising — pretending to be measuring «pristine background levels of carbon dioxide» from the top of the world's highest active volcano, surrounded by active volcanoes on top of a great hot spot creating volcanoes in warm seas rocked by thousands of earthquakes every year.

The correlation between rising levels of carbon dioxide in the atmosphere (red) with rising carbon dioxide levels (blue) and falling pH in the ocean (green).

The President explained what the Administration has already done to reduce the dangerous levels of carbon dioxide that are contributing to climate change, and discussed ways to prepare our communities for the impacts that can not be avoided.

In addition to causing changes in climate, increasing levels of carbon dioxide from the burning of fossil fuels and other human activities have a direct effect on the world's oceans.

«A NEW peer - reviewed paper using observations rather than computer models has found the Earth's climate was less sensitive to increasing levels of carbon dioxide in the atmosphere than predicted by the Intergovernmental Panel on Climate Change.

In this stylized representation of the human - intensified greenhouse effect, human activities, predominantly the burning of fossil fuels (coal, oil, and gas), are increasing levels of carbon dioxide and other heat - trapping gases, increasing the natural greenhouse effect and thus Earth's temperature.

However, rising levels of carbon dioxide emissions from burning fossil fuels like coal are contributing to climate change.

Carbon dioxide levels threaten oceans regardless of global warming Carbon dioxide levels threaten oceans regardless of global warming Rhett A. Butler, mongabay.com March 8, 2007 Rising levels of carbon dioxide...

But rising levels of carbon dioxide could also affect the quality of plant growth, according to a new study in Global Change Biology.