Read IPCC report on impacts and read what climate scientists say instead of speculating-

https://www.carbonbrief.org/in-depth-qa-the-ipccs-sixth-assessment-on-how-climate-change-impacts-the-world/

https://climatefeedback.org/claimreview/prediction-extinction-rebellion-climate-change-will-kill-6-billion-people-unsupported-roger-hallam-bbc/

https://nitter.kavin.rocks/MichaelEMann/status/1432786640943173632#m

https://nitter.42l.fr/ClimateAdam/status/1553757380827140097

https://nitter.42l.fr/GlobalEcoGuy/status/1477784375060279299#m

https://nitter.42l.fr/JacquelynGill/status/1553503548331249664#m

https://nitter.kavin.rocks/hausfath/status/1533875297220587520#m

https://nitter.42l.fr/JacquelynGill/status/1513918579657232388#m

https://nitter.42l.fr/waiterich/status/1477716206907965440#m

https://climatefeedback.org/evaluation/iflscience-story-on-speculative-report-provides-little-scientific-context-james-felton/

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Information on marine biomass decline from recent ipcc report: "Global models also project a loss in marine biomass (the total weight of all animal and plant life in the ocean) of around -6% (±4%) under SSP1-2.6 by 2080-99, relative to 1995-2014. Under SSP5-8.5, this rises to a -16% (±9%) decline. In both cases, there is “significant regional variation” in both the magnitude of the change and the associated uncertainties, the report says." phytoplankton in particular is projected to decline by ~10% in worst-case emissions scenario.

https://www.carbonbrief.org/in-depth-qa-the-ipccs-sixth-assessment-on-how-climate-change-impacts-the-world/#oceans

https://www.nature.com/articles/s41558-021-01173-9/figures/3

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It is likely that the proportion of all species at very high risk of extinction (categorised as “critically endangered” by the IUCN Red List) will reach 9% (maximum 14%) at 1.5C, 10% (18%) at 2C, 12% (29%) at 3C, 13% (39%) at 4C and 15% (48%) at 5C, the report says.

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https://www.carbonbrief.org/in-depth-qa-the-ipccs-sixth-assessment-on-how-climate-change-impacts-the-world/#land