Professor Ottmar Edenhofer (Potsdam Institute for Climate Impact Research):
"It doesn't cost the Earth to save the planet"

+++ The special report of the IPCC on the 1.5-degree target from 8 October.2018 will be incorporated in the coming months +++

If we want to limit global warming to well below 2°C,
two conditions need to be met in terms to CO2:

(1) Compliance with the remaining CO2 budget

According to the IPCC’s calculations (AR5), our remaining budget amounts to about 1,000 Gt CO2 from 2012 onwards (see CO2 clock below).

In the Paris Agreement, a ratchet up mechanism was decided upon, in which the countries are asked to submit increasingly ambitious national contributions (NDCs). Each country should determine its contributions on the grounds of a fair distribution of the remaining budget.

Based on converging per capita emissions, the Regensburg Model offers some guidance for this. With the help of the web application www.climate-calculator.info you can quickly get an idea of what converging per capita emissions means for individual countries.

An article on the Regensburg Model has been published in the journal "Climate Policy". More information under Downloads.

further short information

(2) CO2 needs a price

All CO2 emissions needs to get a price by means of a carbon tax or emission trading, so that
climate protection will pay for the individual.

The price will have to rise for many years to achieve
the climate targets.

Revenues should be given back to the population
on a per-capita basis.

further short information

What you can do

We still can limit global warming to 2°C
and thus avert the worst consequences for our children and future generations.

Now it is important that

  • we citizens indicate the politicians that we really want to save the climate
  • leaders assume their responsibilities

further short information

Contents of this website

Except for "Downloads" and "Emission pathways" in German.

CO2 budget
The remaining CO2 budget and its distribution to countries.

Exemplary emission paths
Exemplary global and national emission pathways and reference values which comply with the 2°C limit.

Review NDCs
Review process after Paris; reference values for almost all countries in the world based on the Regensburg Model and the Smooth Pathway Model.

Web application: (1) Determine a global path wich comply with the 2°C target. (2) For the years 2030 and 2050 reference values for a selectable country are given on the basis of the Regensburg Formula.

Price on CO2
Why do we need a price on CO2?

What could a road map to ecological prices look like?

Books / links
Books and links on the topic; current own work and discussion papers

Download excel tools and papers: Regensburg Model - Smooth Pahtway Model (Raupach et al.), comparison similar approaches

Life without greenhouse gases
What could a good life almost without greenhouse gases look like?