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Green Coo­ling Sum­mit 2021 | Re­cap Day 3

18.06.2021 , News :

Find all recordings and presentations from the 3rd Day of the Green Cooling Summit. Please note that all presentations are available for download at the end of the page.

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The Green Cooling Summit is jointly hosted by the German Environment Agency (UBA), Deutsche Gesellschaft für Internationale Zusammenarbeit (GIZ) and the Federal Ministry for the Environment, Nature Conservation and Nuclear Safety (BMU). The virtual conference addresses how the phase-down of hydrofluorocarbons (HFCs) according to the Kigali Amendment to the Montreal Protocol can best be implemented and accelerated politically and technically through the use of natural refrigerants and improved energy efficiency.

Day 3


What needs to be done to implement natural refrigerants on a broader scale? Collin Bootsveld (Colruyt Group) argues that a stronger regulatory framework would help. The industry, he says, is ready.

Video Opening

Keyno­te: La­test fin­dings on the fa­te of HFO-1234ze in the at­mo­s­phe­re

Unsaturated HFCs, marketed as hydrofluoroolefins (HFOs) by synthetic refrigerant manufacturers, are presented as alternatives to high-GWP HFCs. In fact, HFOs exhibit a low GWP similar to natural refrigerants because of their rapid decay in the atmosphere. In his keynote talk, Christopher Hansen from the University of New South Wales in Sydney, Australia, will present his latest findings on the fate of HFO-1234ze released to the atmosphere. He has collected evidence that one of the final HFO-1234ze decomposition products is HFC-23, the most powerful HFC regarding climate impact with a GWP of 14,800 according to the 4th IPCC Assessment Report. This raises serious doubts regarding the use of HFO-1234ze as an HFC alternative in refrigeration and air conditioning as well as other applications such as foam blowing.

The paper discussed is still under review and is therefore not yet published externally.

Ses­si­on 4

Evaporative cooling and urban heat islands

Urban heat islands have a measurable effect on the global climate. What are effective measures in reducing their GWP then? In their keynotes, Massimo Palme (UCN), Markus Offermann (Guidehouse), Sibylle Braungardt (Öko-Institut) and Michael Bruse (ENVI_MET) provide numerous cooling solutions – some of which are perhaps surprising. From Tunis to Freiburg to Santiago de Chile, our experts explain how urban heat islands differ across continents, and how we can work together for natural mitigation.

Video Session 4

Ses­si­on 5 and Clo­sing

Production and storage in the food sector

With the Green Cooling Summit coming to an end, it has become crystal-clear that cooling is not a luxury – it is essential. This is particularly true for the food sector. In discussing the use of natural refrigerants for cold chains, Collin Bootsveld and Ilana Koegelenberg (shecco) therefore suggest that we need approaches that are both technical and human.

Video Session 5 and Closing


It is no exaggeration to claim that cooling has often been ignored in the larger discourse on climate change. The Green Cooling Summit, bringing together vastly different stakeholders, aims to change that – and yet much more needs to be done. In our final panel discussion, Collin Bootsveld, Sophie Geoghegan (EIA), Alexander Cohr Pachai (Liquid Coolers) and Volkmar Hesse (former head of GIZ Proklima) reflect on achievements in the past and the many challenges ahead.

Video Outlook

Grid Overview

Green Coo­ling Sum­mit 2021 | High­lights

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Find all highlights of the Green Cooling Summit compiled here.

Green Coo­ling Sum­mit 2021 | Re­cap Day 1

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Find all recordings and presentations from the 1st Day of the Green Cooling Summit.

Green Coo­ling Sum­mit 2021 | Re­cap Day 2

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Find all recordings and presentations from the 2nd Day of the Green Cooling Summit.