Sentences with phrase «higher atmospheric carbon dioxide levels»

There are no deleterious consequences of higher atmospheric carbon dioxide levels.

Higher atmospheric carbon dioxide levels are wholly beneficial.

In another journal, Geohealth, Dr Myers and a different set of colleagues warn that higher atmospheric carbon dioxide levels are also associated with lower iron content in food crop staples.

Damage to coral reefs from higher ocean temperatures and ocean acidification caused by higher atmospheric carbon dioxide levels, as well as damage from pollution and sedimentation, are threatening these breeding grounds for fish in tropical and subtropical waters.

Other researchers have already suggested that high atmospheric carbon dioxide levels, driven by enormous, slow volcanic eruptions, could have turned the oceans increasingly acidic.

Not exact matches

The relatively pleasant global climate of the past 10,000 years is largely thanks to higher levels of atmospheric carbon dioxide

Record emissions of carbon dioxide mean atmospheric concentrations have reached levels that lead to the highest temperature increases

Also associated with this event are high levels of carbon dioxide in the atmosphere, which are linked to elevated ocean and atmospheric temperatures.

The seven - day rainfall total from Harvey was as much as 40 percent higher than rainfall from a similar storm would have been decades ago, before human activity caused atmospheric carbon dioxide levels to spike, according to a study published yesterday in Geophysical Research Letters.

«Wheat's photosynthetic pathway evolved 100 million years ago when atmospheric carbon dioxide levels were up to 10 times higher than they are today,» he said.

Although plants grown in high levels of carbon dioxide — say, double the current atmospheric concentrations — initially grow rapidly, the growth tapers off within weeks and the plants wind up with a low protein content.

Dr Tina Van De Flierdt, co-author from the Department of Earth Science and Engineering at Imperial College London, says: «The Pliocene Epoch had temperatures that were two or three degrees higher than today and similar atmospheric carbon dioxide levels to today.

«Modern atmospheric carbon dioxide levels are today equivalent to those about three million years ago, when sea level was at least six meters higher because the ice sheets were greatly reduced.

The tropical rainforest was able to persist under elevated temperatures and high levels of atmospheric carbon dioxide,.......

April will be the first time in human history where levels of atmospheric carbon dioxide were higher than 400 parts per million for an entire month, one scientist who monitors the levels said.

And, the IPCC projection is probably too high because it was driven by a collection of climate models which new science indicates produce too much warming given a rise in atmospheric carbon dioxide levels.

The year as a whole gave miserable summer weather to many, and there has been no upward trend of temperatures since the highs of 1998, despite steadily rising atmospheric carbon dioxide levels.

From the University of California — Riverside, and the department of sulfurous odors, comes this «it must be carbon dioxide» moment: «Also associated with this event are high levels of carbon dioxide in the atmosphere, which are linked to elevated ocean and atmospheric temperatures.

Doing that may have just gotten a lot tougher — a new study says atmospheric carbon dioxide levels haven't been this high in more than two million years.

Pierrehumbert RT 2004: High levels of atmospheric carbon dioxide necessary for the termination of global glaciation Nature 429, 646 - 649.

Global atmospheric carbon dioxide concentrations have now passed 400 parts per million (ppm), a level that last occurred about 3 million years ago, when both global average temperature and sea level were significantly higher than today.

The CCSM indicated that ocean waters warmed significantly at higher latitudes because of rising atmospheric levels of carbon dioxide (CO2), a greenhouse gas.

At 380 parts - per - million, atmospheric carbon dioxide levels are at the level highest in 650,000 years.

Antarctic ice core records vividly illustrate that atmospheric carbon dioxide (CO2) levels today are higher than levels recorded over the past 800,000 years (Figure 4).

Increased weed and pest pressure associated with longer growing seasons and warmer winters will be an increasingly important challenge; there are already examples of earlier arrival and increased populations of some insect pests such as corn earworm.64 Furthermore, many of the most aggressive weeds, such as kudzu, benefit more than crop plants from higher atmospheric carbon dioxide, and become more resistant to herbicide control.72 Many weeds respond better than most cash crops to increasing carbon dioxide concentrations, particularly «invasive» weeds with the so - called C3 photosynthetic pathway, and with rapid and expansive growth patterns, including large allocations of below - ground biomass, such as roots.73 Research also suggests that glyphosate (for example, Roundup), the most widely - used herbicide in the United States, loses its efficacy on weeds grown at the increased carbon dioxide levels likely to occur in the coming decades.74 To date, all weed / crop competition studies where the photosynthetic pathway is the same for both species favor weed growth over crop growth as carbon dioxide is increased.72

The last time atmospheric carbon dioxide levels were this high, millions of years ago, the planet was very different.

Climate scientists know that the planet is warming, and dangerously, as a consequence of ever higher carbon dioxide levels in the atmosphere thanks to changes humans have made to the planet's atmospheric chemistry — and they know it can get worse.

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

While we don't know sea level rise in the 21st century, in the long run, sea level was 50 m higher at atmospheric CO2 level of 2x prehistoric (note: we're adding greenhouse gases in addition to carbon dioxide).

The carbon they refer to is Carbon dioxide, / CO2 a gaseous product of the burning of practically any combustible product of this planet and a gas which if the planet lacked or was not present at a sufficiently high atmospheric level and had remained so for countless millenniums past, no sentient life or plant life would exist today.

During this period, a higher than normal levels of atmospheric carbon dioxide lead to hotter planet, and in response fossil evidence of shows that an early ancestor of the horse, Sifrhippus, shrunk to the size of a house cat.

Measured atmospheric concentrations of carbon dioxide are currently 100 ppm higher than pre-industrial levels.

These changes to the ocean are directly linked to anthropogenic carbon dioxide (CO2) emissions, with current atmospheric CO2 levels approximately 30 % higher than over the last 2 Myr [6].

The climate was hot and dry, with atmospheric carbon dioxide levels sitting at about 2,000 parts per million (ppm)-- far higher than our current level of about 405 ppm.