Sentences with phrase «atmospheric concentrations reach»

Parkes and his colleagues ran simulations of a «very mild form» of climate change where carbon emissions rise by 1 % a year until atmospheric concentrations reach double pre-industrial levels (560 parts per million, ppm).

The initial forcing that initiated the warming interglacial periods may have been completely compensated by the time the atmospheric concentration reached 300 PPM.

But I think it best to not lose sight of one pretty clear implication: You don't need to eliminate CO2 emissions for atmospheric concentrations to start dropping, and the higher the atmospheric concentration reaches, the less emissions need to drop to see falling atmospheric concentration.

Interest in tackling climate change in the United States has increased somewhat recently in response to global CO2 atmospheric concentrations reaching 400 ppm, although there is almost no hope of new federal legislation soon.

Also, I am missing a specific statement that acknowledges that the short - term warming projections of TAR (0.15 ° to 0.3 °C per decade) and AR4 (0.2 °C per decade) turned out to be wrong, i.e. there has been no warming since the end of 2000, despite unabated human GHG emissions and atmospheric concentrations reaching record levels.

Not exact matches

At a Feb. 7 hearing of Juliana, et al v. United States of America, et al — a case a group of kids, young adults and environmentalists brought in 2015 against the U.S. government — Frank Volpe said he didn't know whether carbon dioxide levels had reached 400 parts per million, a measurement of atmospheric concentration.

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

Of four common corals and algae tested, three still produced shells in conditions that mimic oceans if atmospheric CO2 concentrations reached 1,000 ppm.

Already, atmospheric concentrations of just CO2 have reached 400 ppm at times and all greenhouse gases put together are now at 430 ppm.

there has been 15 to 25 times more CO2 than current concentrations; the claim that this time we will reach a tipping point is alarmist, ludicrous, and totally without foundation,» declared atmospheric scientist Robert W. Endlich on July 12, 2009.

, / ynoz, xtit = «Year», ytit = «carbon dioxide concentration (ppm)», charsize = 1.5; atmospheric carbon dioxide concentration in ppm showing target achieved plot, a (0:499) +1850, e (0:499) / max (e (0:499)-RRB- * 100, xtit = «year», ytit = «carbon dioxide emissions (AU)», charsize = 1.5; emission profile to reach target in percent of max

The approximately 20 - year lag (between atmospheric CO2 concentration change and reaching equilibrium temperature) is an emerging property (just like sensitivity) of the global climate system in the GCM models used in the paper I linked to above, if I understood it correctly.

A steady state would eventually be reached wherein CO2 loss balanced CO2 uptake, because any tendency of plants to absorb more CO2 would reduce atmospheric concentrations so as to reduce plant growth.

Thus, two models with the same level of cumulative total anthropogenic CO2 emissions may reach different atmospheric CO2 concentrations (see Smith and Edmonds 2006).

And over that time period humans have emitted over 30 % of ALL the CO2 emissions they EVER emitted, and the atmospheric concentration has reached all - time record levels.

But our data reveal a significant deviation from this behaviour: The atmospheric concentration of CO2 during MIS 17 remains significantly below the levels during MIS 13, 15 and 19; this is expected neither from the temperature variations which always reach comparable levels during these interglacials nor from carbon cycle models11.

If we assume (as IPCC does) that human CO2 emissions are the single cause of increased atmospheric CO2 concentrations, the we could asymptotically reach an absolute highest level of atmospheric CO2 of around 1,030 ppmv WHEN ALL FOSSIL FUELS ARE 100 % USED UP.

CO2 emissions continue to follow the same trajectory they've been following for more than a century, atmospheric CO2 will have reached 936 ppmv according to the RCP8.5 concentration pathway formerly known as «business as usual».

And the more decades we have of no warming despite unabated human GHG emissions and atmospheric GHG concentrations reaching record levels, the more the case for an AGW driven climate unravels (the underlying message of the DM article).

Jim D seems to think that increasing atmospheric CO2 concentration, without increasing its temperature close to the surface, will increase downwelling IR reaching the ocean.

[Equilibrium] climate sensitivity is defined as the increase in global mean surface temperature (GMST), once the ocean has reached equilibrium, resulting from a doubling of the equivalent atmospheric CO2 concentration, being the concentration of CO2 that would cause the same radiative forcing as the given mixture of CO2 and other forcing components.

Further, the probabilistic approach reveals a picture startling to even most global - warming pessimists: If we're to avoid precipitating what that U.N. Framework Convention genteelly calls «dangerous anthropogenic interference,» we're going to have to aim at an atmospheric greenhouse - gas concentration target that, by current trends, we'll reach in less than two decades.

Based on a proxy reconstruction, ice - free summers also occurred during a late Miocene warm climate with simulated atmospheric CO2 concentrations of 450 ppm8, a value we also might reach in the near future.

The IPCC 2007 Fourth Assessment of climate change science concluded that large reductions in the emissions of greenhouse gases, principally CO2, are needed soon to slow the increase of atmospheric concentrations, and avoid reaching unacceptable levels.However, climate change is happening even faster than previously estimated; global CO2 emissions since 2000 have been higher than even the highest predictions, Arctic sea ice has been melting at rates much faster than predicted, and the rise in the sea level has become more rapid.

Given such application / uses the five Dutch researchers set out to learn how the growth of this species might be affected by rising concentrations of atmospheric CO2 expected to be reached over the course of this century.

Among other things, it cites a 1979 internal Exxon document that discusses academic research around possible changes in the climate once atmospheric concentrations of carbon dioxide reach about 500 parts per million.

Climate sensitivity is usually defined to mean the amount of warming that the Earth will experience if atmospheric concentrations of CO2 reach 560 ppm of CO2 equivalent, where CO2 equivalent is the metric which translates other greenhouse gases into an equivalent level of CO2.

Any national ghg emissions reduction is implicitly a position on a safe atmospheric ghg concentration and that nation's fair share of total global emissions that will reach that target.

Yesterday it was announced by the World Meteorological Organization (an arm of the United Nations), with front page coverage by the global media, that the atmospheric concentration of carbon dioxide (CO2) last year reached a new high value (396 parts per million, ppm) and got there in record time (2.9 ppm / yr).

The atmospheric concentration of carbon dioxide (CO2) has recently reached a «milestone» of 400 parts per million (ppm).

And yet, despite the explosive increase in CO2 emissions, the atmospheric CO2 concentration is nowhere close to reaching 660 ppm.

If the study is indeed an accurate representation of the effects of CO2 on humans, though, it will come as a big surprise to the US navy submarine service, where CO2 concentrations frequently reach 8,000 ppm (20 times current atmospheric levels) with few observed adverse reactions.

Water that travels past under - sea volcanism will dissolve sulphur ions which reduce its pH. This low pH water will reach the ocean surface centuries later and thus will reduce the pH of the surface layer with resulting increase to atmospheric CO2 concentration.

Charging businesses and individuals a rising and transparent price for carbon dioxide emissions is essential to reduce U.S. emissions quickly and steeply enough to prevent atmospheric concentrations of CO2 from reaching an irreversible tipping point.

With our current atmospheric and oceanic compartments, that point is reached when about half the excess concentration has disappeared and half is left.

Levels of greenhouse gases such as carbon dioxide and nitrous oxide continue to climb, the report authors say; atmospheric CO2 concentrations reached a global average of 397.2 ppm last year, compared with the average of 354.0 in 1990, the first year the annual State of the Climate report was issued.

In fact, among the 900 scenarios the report authors examined, if greenhouse gas concentrations remain above current levels in 2030, «many models... could not produce scenarios reaching atmospheric concentration levels that make it as likely as not that temperature change will remain below 2 °C relative to pre ‐ industrial levels.»

At the present rate, with no acceleration, it probably would take about 12 years for atmospheric concentrations of CO2 to reach 400ppm.

From the Hollywood Hills to London's South Bank, TreeHugger readers and writers sent in photos from International Day of Climate Action / 350 — when atmospheric concentrations of carbon dioxide reach 350 ppm, global warming is dangerously out of control — events worldwide.

Concentrations of dissolved methane on the Siberian shelf reached 25 times higher than atmospheric saturation, indicating escape of methane from coastal erosion into the atmosphere [Shakhova et al., 2005].

Concentrations in submarines can reach up to 25 times the normal atmospheric levels without causing harmful effects on the crew.