Scientific studies and models indicate we need to prevent CO₂ levels from reaching an irreversible tipping point of ____ ppm, which could set into motion large-scale, long-term changes.

Question

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According to multiple scientific studies and reports, including those by the Intergovernmental Panel on Climate Change (IPCC), we need to keep global CO₂ levels below 450 ppm to avoid catastrophic and irreversible impacts such as sea level rise, extreme weather events, and ecosystem changes. This is the threshold also agreed upon by the 2015 Paris Agreement on climate change. Keeping CO₂ levels below this threshold will require significant and urgent reductions in greenhouse gas emissions.

Scientific Studies and Models Indicate We Need to Prevent CO₂