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1/ New opinion article @UniLUT & international collaborators doi.org/10.1371/journa… discusses requirement of tightening the 1.5°C climate target to avoid risk of elevating climate tipping points. A 1.0C climate target is a safer target and possible via negative emissions. 
2/ Even the 1.5°C climate target requires about 500 GtCO2 negative emissions if fully accounting for uncertainties. Climate budget according to @IPCC_CH for reaching 1.5°C with max certainty has been used up in early 2022.
3/ Though reaching the 1.5C target seems already hard to reach, it is not a safe target for civilisation. Local extreme weather events will have global consequences risking global food security doi.org/10.1038/s41558…
4/ The instability of the Greenland & West Antarctic Ice Sheets can already be observed at currently ~1.2°C global warming. Loosing these ice sheets poses existential threat to coastal settlements and entire nation states due to significant sea level rise. doi.org/10.1038/s43247…
5/ Reducing atmospheric CO2 concentration to ~350 ppm by the end of this century may be required & climate restoration in long term. A limited overshoot beyond 1.5°C is to be kept as strictly as possible avoiding additional tipping points to be triggered. doi.org/10.5194/esd-8-…
6/ Cheap & abundantly available renewable electricity enables a paradigm shift in energy supply doi.org/10.1109/ACCESS…. Natural carbon sinks, eg reforestation, may be limited to 16 GtCO2 negative emissions p.a. while ~40 GtCO2 will be required to re-balance the climate to 1.0°C.
7/ Negative emission technologies powered by renewable electricity such as DACCS offer attractive and scalable options for long-term secure CO2 sequestration. First research estimates about 10% of global primary energy demand required by 2100. doi.org/10.1016/j.ener…
8/ In the light of opportunities arising from low-cost renewable electricity we call for a new discourse on sharpening the climate target to 1.0°C. Reaching net zero is the priority by 2050 as a fundament to build on climate restoration in the second half of this century.
9/ this opinion article is an international collaboration of @UniLUT @MCC_Berlin @efesce @thermokars @GregNemet @jlbamber @TerliWetter @c_gerhards @KeinerDominik
@Peters_Glen @rahmstorf @GunnarLuderer @mzjacobson @BrianVad @nduic @ProfStrachan @pfairley @JStrefler @BenjaminSovaco1 @ClimateTipPoint @MichaelEMann @prof_sterner @CKemfert @kei_sakurai @JuttaPaulusRLP @Ma_Deutsch @gelderon52 @AukeHoekstra @JeroAhola @PetteriLaakson4
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