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Articles by: Yale Environment 360

Atmospheric CO2 Level May Not Drop Below 400 ppm “Within Our Lifetimes”

Atmospheric CO2 Level May Not Drop Below 400 ppm “Within Our Lifetimes”

Atmospheric concentrations of CO2 will stay permanently above 400 parts per million (ppm) this year due to El Nino—and will likely not drop below that number again “within our lifetimes,” according to a study published this week in the journal Nature. The milestone represents a symbolic threshold that scientists and environmentalists had long sought to avoid. Greenhouse gases have jumped 48[Read More…]