Yet understanding how delay makes achieving the goals of preventing dangerous climate change extraordinarily more challenging also requires some knowledge about how increasing atmospheric concentrations affect
global emissions reductions pathways options.
Our results show that very aggressive
future emissions reduction pathways, in which rapid and deep mitigation begins today (not 5 - 10 years earlier as in many emissions scenarios), would be approximately consistent with the long - term temperature goals of the Paris Agreement.
But the
proposed emissions reduction pathway beyond 2020 (known as Intended Nationally Determined Contribution or INDC) reveals a huge gap between current climate action pledges and what science and equity tells us is needed to adequately combat climate change
Decisions made in relation to Article 2 will determine the level of GHG concentrations in the atmosphere (or the corresponding climate change) that is set as the goal for policy and have fundamental implications
for emission reduction pathways as well as the scale of adaptation required.
If every country from now on reduced their emissions from present levels by the same percentage per year, that would put the world on an
inertia emissions reduction pathway (see Peters et al. 2015).
So quickly that, even if the wealthy countries were to bring their emissions down to zero, the developing countries would still have to more or less immediately find their own
emergency emissions reduction pathways.
The ecosystem costs of
the emission reduction pathways may outweigh the benefits of lower warming.
Participants sourcing from affected facilities must match this generation with either a) the retirement of eligible emissions allowances or b) the retirement of «Green - e compliant ERUs,» which were generated as a result of emissions reductions beyond
the emissions reduction pathway at a covered party.
The following chart shows
the emissions reduction pathways that are needed in this century to give the world any reasonable hope of limiting warming to 2 °C, assuming global emissions continue to rise at current levels during the next few years.