With supply chains key to hitting net zero targets , we walk through the key events that led the world from ignorance of carbon-emissions dangers to a global undertaking to be net zero by 2050

The Rio Earth Summit

Officially known as the UN Conference on Environment and Development , it produces conventions on climate change , biodiversity and forestry . It recommends a raft of development practices called Agenda 21 . A treaty follows , to “ stabilize greenhouse gas concentrations in the atmosphere at a level that will prevent dangerous interference with the climate system ”. It decrees every year a Conference of the Parties ( COP ) will take place .

The Intergovernmental Panel on Climate Change

The IPCC states that to stop global warming , net carbon emissions must be zero . This is then enshrined in Article 4.1 of the Paris Agreement , which stipulates countries must aim for net zero emissions by the second half of the century . In 2017 , Sweden becomes the first country to pass a net zero law . In 2019 the UK is the first G7 economy to do so and 2021 net zero pledges cover two-thirds of the world .

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