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 …

Since 1750, land-use change and fossil fuel combustion has led to a 46% increase in the
atmospheric carbon dioxide (CO 2) concentrations, causing global warming with substantial …

Combustion-derived black carbon (BC) aerosols accelerate glacier melting in the Himalayas
and in Tibet (the Third Pole (TP)), thereby limiting the sustainable freshwater supplies for …

We present a compilation of tropospheric 14CO2 for the period 1950–2010, based on
published radiocarbon data from selected records of atmospheric CO2 sampling and tree …

Abstract In this “Grand Challenges” paper, we review how the carbon isotopic composition of
atmospheric CO2 has changed since the Industrial Revolution due to human activities and …

The definitive paper by Stuiver and Polach (1977) established the conventions for reporting
of radiocarbon data for chronological and geophysical studies based on the radioactive …

Carbonaceous aerosols cause strong atmospheric heating and large surface cooling that is
as important to South Asian climate forcing as greenhouse gases, yet the aerosol sources …

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 …

A comprehensive tropospheric 14CO2 data set of quasi-continuous observations covering
the time span from 1959 to 2003 is presented. Samples were collected at 3 European …

We report national scale estimates of CO2 emissions from fossil-fuel combustion and
cement production in the United States based directly on atmospheric observations, using a …