A new study, published in the journal Climatic Change, finds an 80% chance that summers between 2061 and 2081 will be hotter than any in nearly the last 100 years if greenhouse gas emissions aren’t reduced, which means average temperatures could rise as much as 5°C (9°F).

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A new study, published in the journal Climatic Change, finds an 80% chance that summers between 2061 and 2081 will be hotter than any in nearly the last 100 years if greenhouse gas emissions aren’t reduced, which means average temperatures could rise as much as 5°C (9°F).