Net Zero? Hmmmm. It means balancing carbon emissions with negative emission technologies or natural sinks like trees. But there are several reasons to be suspicious. (1)
First, companies mislead about their levels of emissions. Yesterday FT reported that Shell and other companies report their tankers full of oil are greenwashed as 'carbon neutral' because the transport costs are offset...without assessing the emissions from the oil itself... (2) Image
Second how reliable are the carbon capture and storage technologies or their projected efficiency in future? In 2007 we were told CCS would solve the problem by now. We are a long way off. (3)
Third, carbon stored in soils or trees or in the sea can leak back into the atmosphere. (4)
Fourth, nations mislead us and the media by ignoring emissions from consumption rather than production. Things made in China are consumed in the west...whose emissions are they? Our carbon footprint is much higher than is reported. Almost half UK emissions r from consumption (5)
Fifth, net zero models are at best dubious, often bordering on fantasy. We must cut emissions as quickly as possible if we're to avoid triggering any one of several tipping points. But emissions are rapidly rising. (6)
Businesses set “net-zero” corporate goals w negative emissions “offsets” eg Heathrow pays for peat-bog restoration to offset, + oil companies for expansive afforestation. But these goals ensure continued emissions from aviation +fossil fuel extraction. (7)
Welsby and colleagues in Nature paint a bleak picture. We need to be reducing emissions by 3% per year to have a 50% chance of meeting 1.5 degrees. So we need to keep fossil fuels in the ground. (8) nature.com/articles/s4158…

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More from @globalhlthtwit

6 Nov
My BMJ article ‘ WHO in its present form is not fit for purpose—an essay by Anthony Costello’ is behind a members paywall. if you want to read it, it is copied here. Page 1. Image
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Read 12 tweets
5 Nov
Voices from Glasgow. A pictorial thread Image
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4 Nov
At #COP26Glasgow South Africa express deep concern about the Green Climate Fund. That it reflects the interests of donors far more than recipient countries.
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3 Nov
John Kerry, President of Palau in S. Pacific + Panama’s foreign minister address the ocean-climate crisis. Oceans control our climate and our oxygen.
Panama one of only two countries that see whales from both poles.
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17 Oct
THOSE 4 COP 26 GOALS for our children's future.
1. Secure global net zero by mid-century and keep 1.5 degrees within reach:
- accelerate the phase-out of coal
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- speed up the switch to electric vehicles
- encourage investment in renewables.
2. Adapt to protect communities and natural habitats. At COP26 we must:
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- build defences, warning systems and resilient infrastructure and agriculture to avoid loss of homes, livelihoods and even lives
3. Mobilise finance
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- International financial institutions must unleash the trillions in private and public sector finance required to secure global net zero.
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1 Oct
A new UNICEF report unicef.org/reports/fed-to… shows that worldwide, two out of every three children between the ages of 6 months to two years are not getting the nutritious diets they need to grow well. They propose ten actions: (1)
Food system
1. Increase the availability and affordability of nutritious foods – including fruits, vegetables, eggs, fish, meat and fortified foods – by incentivizing their production, distribution and retailing. (2)
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