INTERNATIONAL ENERGY JOURNAL
Volume 21, No. 01, Month MARCH, Year 2021, Pages 147 - 158
Halving global co2 emissions by 2050: technologies and costs
Lola Vallejo, Christoph Mazur, Alexandre Strapasson, Tim Cockerill, Ajay Gambhir, Tom Hills, Mark Jennings, Owain Jones, Nicole Kalas, James Keirstead, Cheng Khor, Tamaryn Napp, Danlu Tong, Jeremy Woods, Nilay Shah
This study provides a whole-systems simulation on how to halve global CO2
emissions by 2050, compared to 2010, with an emphasis on technologies and
costs, in order to avoid a dangerous increase in the global mean surface
temperature by end the of this century. There still remains uncertainty as to how
much a low-carbon energy system costs compared to a high-carbon system.
Integrated assessment models (IAMs) show a large range of costs of mitigation
towards the 2°C target, with up to an order of magnitude difference between the
highest and lowest cost, depending on a number of factors including model
structure, technology availability and costs, and the degree of feedback with the
wider macro-economy. A simpler analysis potentially serves to highlight where
costs fall and to what degree. Here we show that the additional cost of a lowcarbon energy system is less than 1% of global GDP more than a system resulting
from low mitigation effort. The proposed approach aligns with some previous
IAMs and other projections discussed in the paper, whilst also providing a clearer
and more detailed view of the world. etc...
Keywords
Carbon emissions, Climate change mitigation, Energy economics, Energy systems, Environmental policy