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A little-known index is key to understanding how the Earth's climate continues to build up heat in the air and oceans, resulting in sweeping changes across the globe.

Expand chart
Adapted from a NOAA Earth System Research Laboratory report; Chart: Axios Visuals

Why it matters: Known as the Annual Greenhouse Gas Index, or AGGI, which NOAA produces, it clearly shows that despite numerous agreements and goals for cutting greenhouse gas emissions, the ability of the atmosphere to trap extra heat keeps growing.

Details: This year the AGGI rose to a value of 1.43, meaning that the increase in the atmosphere’s heat-trapping capacity attributable to human activity has risen 43% since 1990. James Butler, who directs NOAA's air monitoring program, tells Axios the growth in the AGGI is accelerating.

  • "It’s a measure of what we’ve already committed towards causing climate to change,” Butler says. "Since 1990, we’ve added 43% more long-lived greenhouse gases than in the previous 240 years.”

Go deeper

Ina Fried, author of Login
58 mins ago - Technology

Google's parent shuts down effort to deliver internet via balloons

Image: Loon

Alphabet is shutting down Loon, one of its "moonshots," which aimed to deliver internet service via high-altitude balloons.

Why it matters: The effort was one of several approaches designed to get high-speed connectivity to some of the world's most remote spots and proved useful in the aftermath of disasters that shut down traditional infrastructure.

Dave Lawler, author of World
1 hour ago - World

What has and hasn't changed as Biden takes over U.S. foreign policy

Photo Illustration: Brendan Lynch/Axios. Photo: Chip Somodevilla/Getty Images

President Biden swiftly recommitted the U.S. to the Paris climate pact and the World Health Organization, but America's broader foreign policy is in a state of flux between the Trump and Biden eras.

Driving the news: One of the most striking moves from the Biden administration thus far was a show of continuity — concurring with the Trump administration's last-minute determination that China had committed "genocide" against Uyghur Muslims.

Updated 3 hours ago - Politics & Policy

Coronavirus dashboard

Illustration: Aïda Amer/Axios

  1. Health: New coronavirus cases down, but more bad news ahead — Fighting COVID-19's effects on gender equality.
  2. Politics: Biden unveils "wartime" COVID strategyBiden's COVID-19 bubble.
  3. Vaccine: NYC postpones vaccine appointments following shipment delays — Private companies step in to fill vaccine logistics vacuum.
  4. World: Biden will order U.S. to rejoin World Health OrganizationBiden to bring U.S. into global COVAX initiative for equitable vaccine access.

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