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Ocean Temperatures, Acidity, and Oxygen Levels — Limiting warming to 1.5 degrees Celsius would reduce increases in ocean temperature and associated increases in ocean acidity and decreases in oxygen levels, which pose significant risks to marine biodiversity, fisheries, and ecosystems.
At 1.5 degrees Celsius warming, the report projects that climate-related risks to human health, livelihoods, food security, human security, water supply, and economic growth will all increase, and will increase even more at 2 degrees warming
Impacts on Biodiversity and Ecosystems
At 1.5 degrees Celsius warming, 6 percent of insects, 8 percent of plants, and 4 percent of vertebrates will see their climatically determining geographic range reduced by more than half.
The impacts of climate change haven’t been spread evenly around our planet and they won’t be in the future, either. Temperatures increase at different speeds everywhere, with warming generally higher over land areas than oceans. The strongest warming is happening in the Arctic during its cool seasons, and in Earth’s mid-latitude regions during the warm season.
Loss of Species and Extinction — The report studied 105,000 species of insects, plants, and vertebrates. At 1.5 degrees Celsius warming, 6 percent of insects, 8 percent of plants, and 4 percent of vertebrates will see their climatically determining geographic range reduced by more than half
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