Sentences with phrase «from higher carbon dioxide levels»

If the feedbacks from higher carbon dioxide levels are strongly positive, then in past geological eras when CO2 levels were much higher than today there should have occurred the «runaway climate» that James Hansen fantasizes about.

Plants such as coniferous trees that associate with ectomycorrhizal fungi can derive benefits from higher carbon dioxide levels, but plants associated with arbuscular mycorrhizal fungi, such as grassland vegetation, can't.

Fish raised in the more acidic seawater that would result from higher carbon dioxide levels forget to flee predators.

Not exact matches

New figures from the Carbon Dioxide Information Analysis Center have found that carbon emissions likely hit their highest levels ever in 2010 (the numbers are partially preliminary estimates).

At night, for example, water in the estuary had higher carbon dioxide, lower pH levels, and a lower saturation state from the collective «exhale» of the ecosystem.

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.

Indeed, when the researchers exposed chloroplasts extracted from wheat cells to nitrate, they found that high carbon dioxide levels inhibited the amount of nitrogen that got inside the chloroplasts to be converted.

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.

The global average carbon dioxide level reached a new record high of 397.2 parts per million last year, a nearly 2 ppm rise from 2013 and a 40 percent increase from preindustrial levels.

If a large amount of nitrogen comes from rocks, it helps explain how natural ecosystems like boreal forests are capable of taking up high levels of carbon dioxide.

In fact, there is an accumulating body of reviewed, published research shaving away the high end of the range of possible warming estimates from doubled carbon dioxide levels.

But Hansen and his co-authors argue this emissions» limit must be cut in half to draw carbon dioxide levels down to 350 parts per million from their current level of 395 ppm (the highest they have been in 3 million years) and to stabilize global temperatures.

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.

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.

With carbon dioxide levels shooting up to unprecedented levels, it is high time we group together for a concerted action against the huge amounts of climate - change - inducing emissions from fires in Hell.

Finally, two weeks ago the EPA issued its draft guidelines on existing fossil fuel power plants, setting a nationwide goal of a 30 percent reduction in carbon dioxide emissions from those plants by 2030, compared to 2005 levels (which were higher than today's).

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

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.

Following heat extraction, the cold water could be returned to a higher level - the resulting negative pressure gradient would make leakage of carbon dioxide from below less likely.

To cover this vast amount of ground, it discusses, at a high level, subjects ranging from observations of various parts of the climate system and climate modelling to the limits of economic assessments, the different pathways of greenhouse gas emissions considered, adaptation response strategies and methods of mitigation that include everything from from taxing greenhouse gas emissions to removing carbon dioxide directly from the atmosphere.

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.

Environmental problems, such as high levels of carbon dioxide, may either find their root cause in natural events or result from human intervention.

We then raise the ceiling (by adding carbon dioxide) and take note that the level in the atmosphere from which the earth radiates to space in now higher up and thus colder (on account of the fixed lapse rate).

The mid-Cretaceous was characterized by geography and an ocean circulation that was vastly different from today; as well as higher carbon dioxide levels (at least 2 to 4 times higher than today).

But given that carbon dioxide levels were now substantially higher than anything in the past two millions of years, in either glacials or interglacials, it had become abundantly clear that the greenhouse effect was something we needed to take extremely seriously: even if the precise future increase in temperature was still an unknown quantity, with a fairly wide error - range, models indicated that for a doubling of carbon dioxide from pre-industrial levels, a rise of three degrees celsius as a global average was the most likely outcome.

On the one side, we know that the level of carbon dioxide in the atmosphere was much lower during past ice - ages than during warm periods, so it is reasonable to expect that an artificially high level of carbon dioxide might stop an ice - age from beginning.

While studies show conflicting dates for when Earth's atmosphere last had carbon dioxide levels this high, estimates range from 800,000 years ago to 15 million years ago.