When are negative emissions negative emissions?

Focus on negative emissions

The promise of negative emissions.

IN THEIR PERSPECTIVE “The trouble with negative emissions” (14 October, p. 182), K. Anderson and G. Peters assert that negative-emissions technologies are an “unjust and high-stakes gamble.” This characterization would sideline negativeemissions technologies and remove potentially important options from the portfolio for mitigating and ameliorating climate change. As Anderson and Peters acknowl...

Negative CO2 emissions via enhanced silicate weathering in coastal environments

Negative emission technologies (NETs) target the removal of carbon dioxide (CO2) from the atmosphere, and are being actively investigated as a strategy to limit global warming to within the 1.5-2°C targets of the 2015 UN climate agreement. Enhanced silicate weathering (ESW) proposes to exploit the natural process of mineral weathering for the removal of CO2 from the atmosphere. Here, we discuss...

A Numerical Investigation of the Potential for Negative Emissions Leakage

Leakage of greenhouse gas emissions— increased emissions in unconstrained regions due to regulations in other regions— undermines the effectiveness of sub-global climate regulations, reduces incentives for unilateral climate initiatives, and can result in distortionary trade measures (Winchester, 2012). These concerns are expressed in measures to reduce leakage included in the EU Emissions Trad...

Microwave radio emissions of negative cloud-to-ground lightning flashes

Article history: Received 6 August 2012 Received in revised form 31 January 2013 Accepted 6 February 2013 We report preliminary results of a new observational study of microwave-frequency electromagnetic radiation that is emitted by lightning discharge processes. Radiation was observed with a ceramic patch antenna and a digital radio receiver tuned to a center frequency of 1.63 GHz and a bandwi...