Earth's climate is warming as a result of anthropogenic emissions of greenhouse gases,
particularly carbon dioxide (CO2) from fossil fuel combustion. Anthropogenic emissions of …

The recent warming in the Arctic is affecting a broad spectrum of physical, ecological, and
human/cultural systems that may be irreversible on century time scales and have the …

This report is the first complete assessment of the science of climate change since Working
Group I (WGI) of the IPCC produced its second report Climate Change 1995: The Science of …

We present a first description and evaluation of GEOS‐CHEM, a global threedimensional (3‐
D) model of tropospheric chemistry driven by assimilated meteorological observations from …

Atmospheric methane grew very rapidly in 2014 (12.7±0.5 ppb/year), 2015 (10.1±0.7
ppb/year), 2016 (7.0±0.7 ppb/year), and 2017 (7.7±0.7 ppb/year), at rates not observed …

The Model for Ozone and Related chemical Tracers, version 4 (MOZART-4) is an offline
global chemical transport model particularly suited for studies of the troposphere. The …

Atmospheric methane plays a major role in controlling climate, yet contemporary methane
trends (1982–2017) have defied explanation with numerous, often conflicting, hypotheses …

Atmospheric greenhouse gas (GHG) concentrations are at unprecedented, record-high
levels compared to the last 800 000 years. Those elevated GHG concentrations warm the …

From 2007 to 2013, the globally averaged mole fraction of methane in the atmosphere
increased by 5.7±1.2 ppb yr− 1. Simultaneously, δ13CCH4 (a measure of the 13C/12C …

We have developed a global three‐dimensional chemical transport model called Model of
Ozone and Related Chemical Tracers (MOZART), version 2. This model, which will be made …