This paper explores the urban carbon cycle from the natural sciences perspective,
identifying key knowledge gaps and priority areas for future research. The combination of …

Global climate change is one of the most important scientific, societal and economic
contemporary challenges. Fundamental understanding of the major processes driving …

Methane (CH4) emissions from natural gas production are not well quantified and have the
potential to offset the climate benefits of natural gas over other fossil fuels. We use …

Based on a uniquely dense network of surface towers measuring continuously the
atmospheric concentrations of greenhouse gases (GHGs), we developed the first …

This synthesis discusses the emissions of carbon dioxide from fossil-fuel combustion and
cement production. While much is known about these emissions, there is still much that is …

Abstract The Indianapolis Flux Experiment (INFLUX) aims to develop and assess methods
for quantifying urban greenhouse gas emissions. Here we use CO2, 14CO2, and CO …

Airborne estimates of greenhouse gas emissions are becoming more prevalent with the
advent of rapid commercial development of trace gas instrumentation featuring increased …

A severe reduction of greenhouse gas emissions is necessary to reach the objectives of the
Paris Agreement. The implementation and continuous evaluation of mitigation measures …

Measurements of Δ14C and CO2 can cleanly separate biogenic and fossil contributions to
CO2 enhancements above background. Our measurements of these tracers in air around …

Megacities are major sources of anthropogenic fossil fuel CO 2 (FFCO 2) emissions. The
spatial extents of these large urban systems cover areas of 10 000 km 2 or more with …