13 April 2021

Net zero emissions must be reached before 2030 for 2°C target, new analysis says

 

by Michael Mazengarb, RenewEconomy

Calculations of global carbon budgets have underestimated potential increases in global temperatures, and the world will have to dramatically accelerate its decarbonisation efforts, a new analysis of climate projections has argued.

According to new briefing note published by the  National Centre for Climate Restoration, also known as Breakthrough, carbon budgets calculated by authorities like the Intergovernmental Panel on Climate Change (IPCC) are virtually meaningless due to a failure to adequately account for feedback effects, and are likely to lock in higher temperature increases.

02 March 2021

Zero by 2050 or 2030? 1.5°C or 2°C? Overshoot or not? Demystifying carbon budgets.


by David Spratt

Confused about carbon budgets for the Paris climate  goals? Zero by 2050 or 2030? 1.5°C or 2°C? Overshoot or not?

There is a maze of contradictory positions,  claiming to be based on research evidence. But the assumptions behind much of that evidence obscures some startling conclusions.  

The Breakthough Briefing Note on "Carbon budgets for 1.5 & 2°C",  released today, explores some of the myths and realities about the Paris Agreement targets and the associated carbon budgets, and what it would really take to achieve them.

The main findings are:

  • IPCC carbon budgets underestimate current and future warming, omit important climate system feedback mechanisms, and make dangerous assumptions about risk-management.
  • 1.5°C of warming is likely by 2030 or earlier, a product of past emissions.
  • There is no carbon budget for the 1.5°C goal; such “budgets” rely on overshoot, with unrealistic reliance on speculative technologies.
  • The current level of greenhouse gases is enough for around 2°C of warming, or more.
  • 2°C of warming is far from safe, and may trigger the “Hothouse Earth” scenario.
  • There is no carbon budget for 2°C if a sensible risk-management approach is taken.
  • Even accepting the IPCC carbon budget for 2°C at face value, emissions need to be zero before 2030 for developed countries with higher per capita emissions.

08 February 2021

Matters of fact that we ignore at our peril

by David Spratt

“Political reality must be grounded in physical reality or it’s completely useless.”  

That statement, by Prof. Hans Joachim Schellnhuber, was the starting point for a presentation I gave on Tuesday 2 February at the "Matters of Fact" public forum organised by the National Climate Emergency Summit as part of its Reset.21 series of public discussions.

On the panel were Sir David King, former Chief Scientific Adviser for the United Kingdom and Sarah Perkins-Kirkpatrick, a climate scientist from the University of NSW. The moderator was journalist and university teacher Jo Chandler.

The video of the event is available on YouTube...  

 


27 January 2021

New research on forests and oceans suggest projections of future warming may be too conservative, with serious consequences

 

By David Spratt

How much will the world warm with ongoing fossil-fuel carbon emissions? It’s a big question that preoccupies policymakers and activists, with important discussions about when the world will hit two degrees, are we really on a path to four degrees of warming with current Paris commitments, and so on.

And the answer is that the world is likely to warm more than current projections, if two recently published pieces of research on the terrestrial and ocean carbon sinks are any guide.

Warming projections and carbon sinks. Future warming projections come from complex climate models, which combine historic data, current observations, equations that encompass current understandings of the bio-geo-physical processes, and some assumptions about processes where direct observation or modelling is more difficult.