It is known that carbon dioxide emissions cause the Earth to warm, but no previous study has focused on examining how long it takes to reach maximum warming following a particular CO 2 emission. Using conjoined results of carbon-cycle and physical-climate model inter-comparison projects (Taylor et al 2012 , Joos et al 2013 ), we find the median time between an emission and maximum warming is 10.1 years, with a 90% probability range of 6.6–30.7 years. Figure 1 shows Temperature increase from an individual emission of carbon dioxide (CO 2 ). Time series of the marginal warming in mK (=milliKelvin = 0.001 K) per GtC (=10 15 g carbon) as projected by 6000 convolution-function simulations for the first 100 years after the emission. Maximum warming occurs a median of 10.1 years after the CO 2 emission event and has a median value of 2.2 mK GtC −1 . The colors represent the relative density of simulations in a given region of the plo...
Carbon tax will be applied to goods imported to the European Union from 2026,the flagship measure in a sweeping suite of European Commission policies unveiled last week to meet the bloc’s 2030 climate target. The tax will mean companies importing iron and steel, aluminium, cement, fertilisers and electricity to the EU will have to buy a certificate for every tonne of carbon dioxide embedded in their goods. In theory, it puts importers’ costs on a par with those of firms within the EU that have to pay for similar certificates in the EU’s internal carbon market. “The idea is to put foreign producers on a level playing field,” says Johanna Lehne at think tank E3G. Formally known as the carbon border adjustment mechanism (CBAM),the scheme is the first of this scale and scope globally. The CBAM’s central aim is to combat “carbon leakage”,the risk of a company in the EU responding to the union’s climate policy costs by relocating outside the bloc to a country that may have a cheaper, but mor...