Sentences with phrase «about carbon levels»

You can talk about carbon levels or glucose levels, but they change based on human behavior.

Not exact matches

During the Eocene, the concentration of carbon dioxide in the atmosphere was more than 560 parts per million, at least twice preindustrial levels, and the epoch kicked off with a global average temperature more than 8 degrees Celsius — about 14 degrees Fahrenheit — warmer than today, gradually cooling over the next 22 million years.

Meanwhile, atmospheric carbon dioxide levels continue to climb, up about 20 percent over the past half century.

About 6000 years ago, levels of atmospheric carbon dioxide rose — and until now slash - and - burn by the 12 million humans on the planet at the time has been blamed.

EPRI's conclusions about energy technology gains were fed into a second computer model to assess the costs of stripping 80 percent of 1990 - level carbon emissions out of the electricity sector by 2050, approximating the goal of the House - passed climate bill.

About a third of the planet's carbon fixation is thought to happen in pyrenoids, yet we know almost nothing about how these structures are formed at a molecular lAbout a third of the planet's carbon fixation is thought to happen in pyrenoids, yet we know almost nothing about how these structures are formed at a molecular labout how these structures are formed at a molecular level.

Fossil fuels cost a lot of money and [have] a lot of climate impact; that's something we haven't covered either, but this plan will also reduce carbon dioxide emissions to about a third of what they are now [by] 2050, assuming some level of growth as well.

Since the beginning of industrialization around 1850, the levels of carbon dioxide have increased from 280 parts per million to about 365 today, says Pieter Tans, of the National Oceanic and Atmospheric Administration.

They used two different climate models, each with a different sensitivity to carbon dioxide, to project California's future under two scenarios: an optimistic one, in which we only double the level of carbon dioxide in the atmosphere — since the 19th century we've already increased it by about a third — and a pessimistic scenario, in which we more than triple CO2.

Glaser et al. show that dust deposition mediated by frequent tropical storms was an important source of nutrients for the Everglades until about 2800 years ago, when a climatic shift in the tropical Atlantic and Gulf of Mexico led to weather patterns that sharply decreased the level of dust inputs and led to a drier climate and a gradual loss of soil phosphorus, carbon, and nitrogen.

The three primary drivers were oil price, which would drive enhanced recovery efforts; carbon tax levels, which would incentivize the trapping of carbon dioxide; and how fast knowledge is gained about the technology, allowing innovations to drive down capital costs.

While the targets are already known — Obama has vowed the United States will curb carbon by 26 to 28 percent below 2005 levels by 2025 — the plan will offer more details about how the administration will achieve the goal.

And while the cut would stabilize atmospheric carbon dioxide levels, it holds them at about 450 parts - per - million, according to the study.

Add to that the aim of reducing the country's carbon dioxide emissions by 80 per cent from 1990 levels before 2050, and an economy emerging from its longest recession since the second world war, and it is easy to see why political debates about the...

So far, the climate system has responded to rising carbon dioxide levels at a fairly steady rate, but many scientists worry about possible nonlinear effects.

When Keeling began his project in 1958 the global carbon dioxide level was about 337 parts per million, already up from the preindustrial levels of about 280 parts per million.

«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.

Although scientists have measured atmospheric CO2 levels for decades, the current network of ground stations, observatories, aircraft and other instruments emerged during an era when researchers were trying to answer questions about the total amount of carbon dioxide in the atmosphere.

Say we forget about solving the climate problem and just continue to burn all this carbon: We change the pH and carbonate, we have four times the preindustrial CO2 level, we live in that world.

As carbon dioxide levels fell due to weathering, at some point, levels of carbon dioxide and methane became about equal, he conjectures.

Given that solar output four billion years ago was only about 60 percent of what it is today, enhanced levels of carbon dioxide and perhaps ammonia (NH3) must have been present in order to retard the loss of infrared radiation into space.

These videos produced by Plymouth Marine Laboratory provide information about ocean acidification and raises awareness of the implications associated with increasing levels of carbon dioxide and changes in seawater pH levels.

In particular, when we speak about targets of 2 degrees, or even 1.5 degrees, we should remember that climate science has yet to uncover a simple deterministic relationship between carbon emissions and the level of future global warming.

They appear to be related to differences in interpretation of INDCs, assumptions about other countries, level of disaggregation for small countries, choice of global warming potentials to compute carbon dioxide equivalent emissions, treatment of emissions related to land use, and treatment of international aviation and maritime shipping.

Specifically, to reach that probability level, we can burn a total of about one trillion metric tonnes of carbon.

So to reach 350 ppm from just the current level requires removing about 185 GtC from the active carbon cycle.

The public, press and policy makers have been repeatedly told that three claims have widespread scientific support: Global temperature has risen about a degree since the late 19th century; levels of CO2 [carbon dioxide] in the atmosphere have increased by about 30 percent over the same period; and CO2 should contribute to future warming.

If you're involved in the procurement and running of buildings, the chances are you know something about operational carbon emissions — the level of emissions produced from activities including heating, cooling and lighting buildings.

A story in the May 1, 2002, issue of Education Week about air quality in schools («EPA Pushing Improved Air Quality in Schools») should have said that the Mesa, Ariz., school district tested classrooms for high levels of carbon dioxide.

For one this isn't a wide body conversion, the overall width of this Aventador remained the same, but that's about all that remained original, the entire front section, rear section and side sills are totally new, where the DMC Aventador Molto Veloce is a very stylish aerodynamic package and the DMC Aventador Spezial Version is the Stage 2 limited edition evolution (all 10 units are sold out in fact), this Stage 3 takes styling to a totally new level... the E-GT does take a lot of styling ideas from GT racing, just take a look at that massive clear carbon fiber rear wing.

With 755 horsepower the 2019 Chevrolet Corvette zr1 is the most powerful Corvette ever it's also the most technologically advanced behind me are the rolling s's at Road Atlanta and we're here to see if we can reach to the supercar levels of performance afforded by this thing's massive power big tires and the tall wing on the back after that we'll take to the streets to see if a car this powerful can behave itself in public this is a monster of a car I've had some brief track opportunities moving this morning to get used to the pace of this machine which is phenomenal we're gonna warm up as we get out to the road Atlanta and sort of build up to the pace that this car can operate at now initially when you hop in this car you have this shrine to the engine right above you you see the line of the hood it kind of dominates the center of the view you can see over it it doesn't affect visibility but it's immediately obvious and that kind of speaks to what makes this car special it's a monster of an engine listen to that [Music] that is tremendous tremendous acceleration and incredible power but what I finding so far my brief time here at the Atlanta is that everything else in the car is rut has risen to match hurt me while I lay into it on the back straight look you know 150 mile - an - hour indicated we're going to ease up a little bit on it because I need to focus on talking rather than driving but like I was saying the attributes of the rest of the car the steering the braking capability the grip every system of this car is riding to the same level of the power and I think that's what makes it really impressive initially this is undoubtedly a mega mega fast car but it's one that doesn't terrify you with its performance potential there's a level of electronic sophistication that is unparalleled at this price point but it's hard not to get you know totally slipped away by the power of this engine so that's why I keep coming back to it this car has an electronically controlled limited slip differential it has shocks filled with magnetically responsive fluid that can react faster to inputs and everything this car has a super sophisticated stability control system that teaches you how to drive it quick but also makes you go faster we haven't even gotten into exploring it yet because the limits of this car are so high that frankly it takes a while to grow into it but [Music] I think what's impressive about this car is despite how fast it is it is approachable you can buy this car to track dates with it and grow with it as a driver and as an owner I think that's a really special [Music] because you will never be more talented than this car is fast ever unless you are a racing driver casually grazing under 50 miles an hour on this straight okay I'm just going to enjoy driving this now [Music][Applause][Music] this particular Corvette zr1 comes with the cars track performance package a lot of those changes happen underneath the sheet metal but one of the big differences that is immediately obvious is this giant carbon fiber wing now the way this thing is mounted is actually into the structure of the vehicle and it makes you know loading the rear hatch a bit more difficult but we're assuming that's okay if you're looking for the track performance this thing delivers also giving you that performance are these Michelin Pilot Sport cup tires which are basically track oriented tires that you can drive on the street but as we wake our way to the front of the thing what really matters is what's under the hood that's right there's actually a hole in the hood of this thing and that's because this engine is so tall it's tall because it has a larger supercharger and a bunch of added cooling on it to help it you know keep at the right temperature the supercharger is way larger than the one on the zo six and it has a more cooling capacity and the downside is it's taller so it pops literally through the hood the cool thing is from the top you can actually see this shake when you're looking at it from you know a camera from the top of the vehicle this all makes for 755 horsepower making this the most powerful Corvette ever now what's important about that is this not just the power but likewise everything in the car has to be built to accommodate and be able to drive to the level of speed this thing can develop that's why you had the massive cooling so I had the aerodynamics and that's why I had the electronic sophistication inside [Applause] we had a lot of time to take this car on the track yesterday and I've had the night to think about things Matt today two crews on the road and see how this extreme performance machine deals with the sort of more civil minded stuff of street driving the track impressions remain this thing is unquestionably one of the most capable cars you can get from a dealer these days a lot of that's besides the point now because we're on the street we have speed limits they have the ever - present threat of law enforcement around every corner so the question is what does this car feel like in public when you slow this car down it feels like a more powerful Corvette you don't get much tram lining from these big wheels though we as the front end doesn't want to follow grooves in the pavement it is louder it is a little firmer but it's certainly livable on a day to day basis that's surprising for a vehicle of this capability normally these track oriented cars are so hardcore that you wouldn't want to drive them to the racetrack but let's face it you spend more time driving to the track than you do on the track and the fact that this thing works well in both disciplines is really impressive I can also dial everything back and cruise and not feel like I'm getting punished for driving a hardcore track machine that's a that's a really nice accomplishment that's something that you won't find in cars that are this fast and costs maybe double this much the engine in this car dominates the entire experience you can't miss the engine and the whole friend this car is sort of a shrine to it the way it pops out of the hood the way it's covered with coolers around the sides it is the experience of this car and that does make driving this thing special and also the fact that it doesn't look half bad either in fact I think it has some of the coolest looking wheels currently available on a new car this car as we mentioned this car has the track package the track package on this car gives you what they call competition bucket seats which are a little wide for my tastes but I'm you know not the widest person in the world this automatic transmission works well I mean there's so much torque again out of this engine that it can be very smooth and almost imperceptible its clunky on occasion I think I'd might opt for the manual although Chevy tells me about 80 % of its customers will go for the automatic I don't think they're gonna be disappointed and that's gonna be the faster transmission drag strip on the street - and on the racetrack man it was a little bit more satisfying to my taste though we've talked about the exhaust I have it set in the track setting let's quiet it down a little bit so you can hear the difference now I've set that separately from everything else so let's put it stealth what happened to the engine sound that's pretty that's pretty amazing man stealth is really stealth and then go back to track Wow actually a really big difference that's that's pretty great the Corvette has always been a strong value proposition and nowhere is that more evident than this zr1 giving you a nearly unbeatable track performance per dollar now the nice thing is on the road this doesn't feel like a ragged edge track machine either you could genuinely drive it every day the compromises are few and that's what makes this car so special if you like what you see keep it tuned right here and be sure to visit Edmunds.com [Music]

But with atmospheric carbon climbing at an annual rate of 2 ppm and expected to accelerate to 3 ppm, levels could approach 900 ppm by the end of the next century, and conditions that bring about the beginnings of ocean anoxia may be in place.

To stand the best chance of keeping the planetary warming below an internationally agreed target of 3.6 degrees Fahrenheit above preindustrial levels and thus avoiding the most dangerous effects of climate change, the panel found, only about 1 trillion tons of carbon can be burned and the resulting gas spewed into the atmosphere.

In a phone chat, he said that arguments about specific levels of climate sensitivity, or specific goals for carbon dioxide concentrations, have little meaning as long as the world is not slowing down from its accelerating path on emissions.

The right way to say it is something like this: At present, the atmosphere holds about 240 gigatons of carbon in excess of the level that existed prior to the start of the industrial revolution.

Since the start of the industrial revolution, carbon dioxide levels are believed to have risen by about one - third, largely due to the burning of fossil fuels.

The discussion talks explicitly about how diminishing terrestrial and ocean carbon sinks over time require reduced CO2 emissions from fossil fuels / land use to achieve stabilization goals at various levels (e.g. 550 ppmv of CO2 in the atmosphere).

The colors reflect levels of carbon monoxide at an altitude of about 18,000 feet, with the gas providing an indirect indicator of other emissions.

Based on findings related to oceanic acidity levels during the PETM and on calculations about the cycling of carbon among the oceans, air, plants and soil, Dickens and co-authors Richard Zeebe of the University of Hawaii and James Zachos of the University of California - Santa Cruz determined that the level of carbon dioxide in the atmosphere increased by about 70 percent during the PETM.

Yet, as Ashley Ballantyne's work shows, current vegetation levels are still soaking up about have the carbon emissions, even as emission rates have increased.

Using a variety of methods, the authors conclude that the onset of a new ice age would likely begin about 1,500 years from now, if the concentration of carbon dioxide was back below the levels produced since the Industrial Revolution.

Another paper in Science recently estimated that the world's 10 billion acres of forest are now absorbing about a third of carbon emissions, helping to limit carbon dioxide levels and keep the planet cooler than it would be otherwise.

At about 0.04 %, carbon dioxide is a very minor contributor to global warmth, and its effect via level changes on climate are even less — immeasurably small.

The concept, while highlighted by climate campaigners, was challenged on two levels — one on technical points about the number of wedges of avoided carbon dioxide that would be needed by mid-century and the other on the broader interpretation (which was never in the work originally) that this meant the challenge of limiting warming was not that hard.

In fact, that all things green love carbon - dioxide rich environments is the ONLY thing we KNOW about the effects of increase CO2 levels, other than the fact that higher and higher levels of CO2 produce increasingly lesser and lesser amounts of heating due to the «greenhouse effect».

Even if climate sensitivity is somewhat less than the IPCC's median value of about 3 degrees Celsius, atmospheric carbon dioxide levels are increasing exponentially, so a smaller value merely buys an extra decade or two until the same amount of warming is reached.

Specimens of elkhorn coral living in water with excess carbon dioxide have been studied for fertilization rates, ability of larvae to settle on reef substrate (where they produce new corals), and subsequent growth and survival.3 Three levels of carbon dioxide were tested, corresponding to concentrations today, at mid-century, and at the end of the century on a high - emissions path.3, 5 At the mid-century concentration, the ability of fertilization to occur and for larvae to settle successfully on the reef was significantly reduced: around 52 percent, and the decline intensified to about 73 percent at the late - century concentration.3 The corals» ability to survive over the long run declined as well, by an average of 39 percent and 50 percent respectively.3, 4

If the models were forced to run with a lower sensitivity to carbon dioxide emissions, their sea level rise projections would decline proportionally, down to about 13 inches.

From preindustrial levels, contemporary surface ocean pH is estimated to have dropped on average from 8.2 to 8.1, or by about 0.1 pH units (a 26 % increase in hydrogen ion concentration), and further decreases of 0.22 to 0.35 pH units are projected over this century unless carbon dioxide emissions are significantly reduced (Orr et al., 2005; Bopp et al., 2013).

Clearly, further research into the carbon cycle will be essential to reduce the level of uncertainty about the climate system's response to CO2 emissions.For further reading: R. T. Watson et al.: «Green - house gases and aero - sols» in Houghton et al., «Climate Change, the IPCC Scientific Assess - ment», Cambridge (1990).