Not exact matches
Taking account of their historic responsibility, as well as the need to secure climate justice for the world's poorest and most vulnerable communities, developed countries must commit to legally binding and ambitious emission reduction targets consistent with
limiting global average surface
warming to well below 1.5 degrees Celsius above preindustrial levels and long - term stabilization of atmospheric greenhouse gas concentrations at well below below 350 p.p.m., and that to achieve this the agreement at COP15 U.N.F.C.C.C. should include a goal of
peaking global emissions by 2015 with a sharp decline thereafter towards a global reduction of 85 percent by 2050,
The turning point must come soon: If global
warming is to be
limited to a maximum of 2 °C above preindustrial values, global emissions need to
peak between 2015 and 2020 and then decline rapidly.
By the carbon - climate response function I gave above (Matthews et al), the best estimate for the decrease in
peak warming is 0.2 C, with the 5 - 95 percentile
limits 0.1 - 0.3 C.
Due to past emissions, and taking into account the most aggressive mitigation strategies,
peak mean global
warming in the 21st Century can
limited close to 1.5 C, with
warming dropping to below 1.5 by 2100.
To understand emissions reductions necessary to have a good chance of
limiting warming to 2 °C, the climate community has focused largely on emissions pathways — that is, when greenhouse gas emissions
peak and the rate at which they must decline (e.g.
peak sooner and then reduce less steeply versus
peak later and then reduce more steeply).
And after another quick scan, I find table SPM.6 from the Synthesis which says emissions would need to
peak sometime before the middle of the century to
limit temperature rises to under 4 degrees (with a
peak by 2015 to achieve less than 2 degrees
warming)... I think most would agree that some degree of «drastic action» is going to be required to achieve a
peak in emissions within this time frame, particularly while we have guys like you running around, would you not?
As previously discussed by Carbon Brief, the later that global emissions
peak the more rapid the reductions must be to
limit warming to 2C.
As a number of scientific articles have shown, most recently by Kevin Anderson and Alice Bows in the Journal of the Royal Society,
limiting the world to 2 °C
warming most likely requires
peaking total global carbon emissions in the next 5 - 10 years followed by immediate reductions to near - zero by 2050 (see Anderson and Bows emission trajectory options here, via David Roberts, and by David Hone here).
The relationship between cumulative emissions and
peak warming allows us to show how delaying mitigation in the short term creates the need for more rapid emission reductions later, in order to stay below a given cumulative emissions
limit.
When uncertainty is minimal (left-most blue data point), the expected budget is around 1000 GtC, which is precisely the value that in the earlier figure gave us 2 °C
peak warming — as it should be because we are examining budgets to
limit warming to 2 °C.
The actual amount of emissions reductions that are needed between now and 2020 is somewhat of a moving target depending on the level of uncertainty that society is willing to accept that a dangerous
warming limit will be exceeded, the most recent increases in ghg emissions rates, and assumptions about when global ghg emissions
peak before beginning rapid reduction rates.
Indeed, pre-2020 mitigation measures are likely the only way
warming can be
limited to 1.5 degrees, as most studies suggest that, to
limit warming to that degree, carbon emissions have to
peak around 2020.
To prevent these and
limit long - term global surface
warming to, for example, 2 °C, a level of stabilization or of
peak atmospheric CO2 concentrations needs to be set.»
If global
warming is to be
limited to 2oC above pre-industrial values, emissions need to
peak between 2015 and 2020 and then decline rapidly.
Andrew Jones of Climate Interactive said: «If we want to
limit warming to no more than two degrees, the world must follow the Paris Agreement soon with improvements to the INDCs: deeper cuts, earlier
peaks, and all countries in, with long term targets.»
For these Mid-Century Strategies (MCSs) to be consistent with the Paris Agreement goal of
limiting future
warming to «well below» 2 °C (3.6 °F), all other countries would need to reach
peak emissions by approximately 2030 and then cut their emissions 3 - 10 % per year, according to new analysis released today from Climate Interactive and MIT Sloan.
Ensuring that global CO2 emissions
peak as soon as possible is crucial for
limiting sea - level rises, even if global
warming is
limited to well below 2 °C.
WRI's recent research shows that while 49 countries have
peaked their emissions, it is still insufficient to
limit warming to 1.5 - 2 degrees C (2.7 - 3.6 degrees F) and prevent the worst effects of climate change.