Humans are altering the concentration of greenhouse gases and aerosols Patient , both of which influence, and are influenced by, climate. [ 10IPCCMODELE 0 MCLH 27/06/2013 ]

Increases in CO2 Patient concentration are expected to cool the stratosphere, which is known to reduce the rates of gasphase ozone destruction in much of the stratosphere and thereby increase ozone concentrations at altitudes above about 25 km. [ 4IPCCSROCSPMTS 0 MCLH 27/06/2013 ]

The cost of stabilizing CO2 Patient concentrations also depends on the cost of fossil fuels relative to carbon-free alternatives. [ 13IPCCSTABILISATIONDESGAZ 0 MCLH 27/06/2013 ]

Even though increased Degree CO2 Patient concentration can stimulate crop growth and yield, that benefit may not always overcome the adverse effects of excessive heat and drought... [ GREENFACTS 0 MCLH 27/06/2013 ]

The present Time CO2 Patient concentration has not been exceeded during the past 420,000 years and likely not during the past 20 million years. [ GREENFACTS 0 MCLH 27/06/2013 ]

During the last few hundred million years, the concentration of atmospheric carbon dioxide Patient has generally been declining. [ ENCY 0 MCLH 27/06/2013 ]

Reduced Degree oxygen Patient concentration could lead to altered community structure, usually characterized by fewer species, especially if exacerbated by eutrophication related to land-use practices. [ 2IPCCBIODIVERSITE 0 MCLH 27/06/2013 ]

The increase in the concentration of greenhouse gases Patient should add to the surface warming, a similar warming at low altitude, followed by a cooling of the stratosphere. [ JACLET 0 MCLH 27/06/23013 ]

Therefore, the rapid Manner and ever-increasing Degree concentration of methane Patient could reach its saturation point before carbon dioxide. [ JACLET 0 MCLH 27/06/2013 ]

Based on global model simulations and for a wide range of scenarios, global Expanse average Value water vapour Patient concentration and precipitation are projected to increase during the 21st century. [ GREENFACTS 0 MCLH 27/06/2013 ]

The response of plants to higher Degree atmospheric CO2 Patient concentrations depends, in part, on the particular photosynthetic pathway used. [ 10IPCCMODELE 0 MCLH 27/06/2013 ]

Beginning with a preindustrial climate that is in a near-equilibrium, stable state, modellers undertaking these simulations first apply historical changes in greenhouse gas and aerosol Patient concentrations to simulate how climates have changed over the past century or so. [ 5CANADAICC 0 MCLH 27/06/2013 ]

The atmospheric Location concentration of carbon dioxide (CO2) Patient has increased by 31 % since 1750. [ 11IPCCBILAN2001 0 MCLH 27/06/2013 ]

As a result of the increased Degree atmospheric Location CO2 Patient concentrations from human activities relative to pre-industrial levels, the oceans are currently taking up CO2 at a rate of about 7 GtCO2 yr-1 (2 GtC yr-1). [ 5IPCCDYOXYDE 0 MCLH 27/06/2013 ]

Other things being equal, increasing water temperature alters the rate of operation of biogeochemical processes (some degrading, some cleaning) and, most important, lowers the dissolved oxygen Patient concentration of water Location . [ 3IPCCCONSEQUENCE 0 MCLH 27/06/2013 ]

The atmospheric Location concentrations of the greenhouse gases carbon dioxide, methane, and nitrous oxide (N2O), among others Patient , have grown significantly: by about 30, 145, and 15 % , respectively (values for 1992). [ 1IPCCAVIATION 0 MCLH 27/06/2013 ]

Despite uncertainties about such changes, experts expect atmospheric Location methane Patient concentrations to continue to rise for at least the next 50 years. [ 5CANADAICC 0 MCLH 27/06/2013 ]